The 8 Best Bluetooth Car Adapters

Our editors independently research, test, and recommend the best products; you can learn more about our review process here. We may receive commissions on purchases made from our chosen links.

The Rundown
Our Top Picks

Most Popular: Nulaxy KM18 Bluetooth Audio Adapter

What We Like
  • Multiple playback sources

  • Easy to read screen

  • Built-in charger

  • iOS and Android compatible

What We Don't Like
  • No off button

  • Must unplug so as not to drain car battery

  • No smart voice assistant capabilities

If you drive an older car, Bluetooth adapters are essential when you want to use your smartphone for music or hands-free calling. The Nulaxy KM18 is a versatile device that uses your car radio’s FM frequencies to stream music from your iOS or Android phone via Bluetooth. It also has options to use a Micro SD card or aux cord. 

The LCD display screen measures 1.44 inches wide and is backlit for easy reading of the caller ID and song titles; it also has a function that monitors your car’s battery charge to alert you to any potential problems. The front has large buttons and a volume dial for easy, one-touch use of all its functions. The unit also has a built-in 5V USB charging port so you can charge your smartphone or other mobile devices on the go. 

Best AUX Adapter: TaoTronics Bluetooth Car Kit

What We Like
  • Connect two devices at once

  • Dual mounting options

  • Built-in charger

  • Built-in ground loop

What We Don't Like
  • No voice assistant

  • No auto on/off

The TaoTronics Bluetooth Car Kit connects via Bluetooth to your iOS or Android mobile device and to your car’s stereo via a 3.5mm audio jack. Using the audio jack rather than blank FM stations ensures clearer sound when listening to music or making calls. The body of this unit features an intuitive button interface that is also backlit for easy use in dim light. 

It comes with both an air vent clip and adhesive/magnetic base so you can choose the best place to install the unit. It comes with a 12V power adapter so you can plug it into your car’s cigarette lighter or 12V outlet. The power adapter has two 5V USB ports so you can power the unit and charge your mobile device at the same time. This Bluetooth adapter can connect two devices at the same time so you and a passenger can use it together. The microphone has built-in ground loop technology to reduce noise interference from your car’s electronics.

Runner-Up, Best AUX Adapter: Kinivo BTC450 Bluetooth Car Kit

What We Like
  • Auto on/off

  • Single button functionality

  • 2 year warranty

  • Built-in charger

What We Don't Like
  • No voice assistant capabilities

  • Can only connect to one device at a time

The Kinivo BTC450 Bluetooth car kit also uses your car’s 3.5mm audio jack to connect your phone or other mobile devices to the stereo. The main body of the unit measures just 1.75 inches across and attaches to your dashboard or center console with an adhesive strip so it stays secure and out of the way. It has just two buttons: one for skipping or repeating tracks and a multifunction button for playing/pausing music or answering/ending calls. 

The built-in noise-canceling microphone ensures that all your phone conversations are crystal clear. Not having a lit LCD screen means you’ll have distraction-free driving, especially at night. The unit automatically turns on and off with your car, so there’s no fear of draining the car’s battery. It also features a built-in noise 5V USB port so you can charge all of your mobile devices while you drive.

Best with Voice Assistant: Nulaxy NX09 LED Bluetooth Adapter

What We Like
  • Fast device charging

  • Multi-input

  • Voice assistant

  • Announces calls

What We Don't Like
  • No auto off

  • No AUX connection

  • Connects to only one device at a time

Like its cousin, the KM18, the Nulaxy NX09 Bluetooth adapter connects to your car’s stereo with a blank radio station. It also features multiple ways to play your music: from your phone via Bluetooth connection, USB flash drive, or Micro SD card. The built-in 5V USB port is designed for super fast charging for your mobile devices; it can charge your phone or tablet to 80% in as little as 35 minutes, so you’ll never have to worry about dead devices on the road. 

The unit is capable of connecting to Siri or Google Assistant with a long press of the volume knob for hands-free directions and texting. It also clearly announces incoming calls so you never miss them while driving. The compact design is wireless and powered by your vehicle’s 12V outlet or cigarette lighter. The body of the unit has LED backlighting that is customizable with seven different colors to fit personality or complement your car’s interior.

Best Wireless Connection: Mpow BH129 Hands-Free Adapter

What We Like
  • Long battery life

  • Voice assistant

  • Fast charging

  • Multi-device connection

  • Auto connect to device

What We Don't Like
  • No auto on/off

  • No call announcement

  • No multi-input

  • No built-in charge

The Mpow BH129 Bluetooth adapter connects to your car stereo via a 3.5mm AUX input and to your car via a Bluetooth 5.0 connection. It has a built-in lithium ion battery that gives you up to 15 hours of use and charges to 100% in as little as 45 minutes. Even on a brief charge, the unit can give you up to two hours of calling, making it great for emergency roadside situations. 

It works with both iOS and Android devices and can connect to two devices at once so you and a passenger can use it at the same time, or you can connect a phone and tablet for multiple audio streaming options. The BH129 will automatically connect to the device it was most recently paired with used with for easy set up every time you enter your car. The front of the unit has a single-button input for easy control over your music and calls. The device can also be used with Siri or Google Assistant for voice-activated controls while driving.

Best Battery Life: TaoTronics TT-BR010 Wireless Bluetooth Adapter

What We Like
  • Long battery life

  • Multi-device connection

  • Auto Bluetooth connection

What We Don't Like
  • No built-in mic

  • No auto on/off

  • No voice assistant or call announcement

  • No music controls on device

The TaoTronics TT-BR010 wireless Bluetooth adapter has one of the most impressive battery lives on the market. On a full charge, it can provide you with up to 55 hours of use for making calls or streaming music. It comes packaged with a mini-USB charging cable, 3.5mm AUX cable, and 3.5mm to RCA connection for use with home theatre systems. When using it with your car stereo, it connects to the dashboard with the 3.5mm AUX cable for clearer sound than devices that use blank FM stations. 

You can connect two different mobile devices at once so you and a passenger can use it, or you can stream music from one device while taking calls on another. The unit automatically pairs with the last Bluetooth device it was used with for quick set up each time you need it. The compact and lightweight design makes it perfect for tucking away in your car’s center console for distraction-free driving. The front of the unit has a single button for power, answering and ending calls, and playing or pausing your music; this makes it safer to use while driving so you aren’t fumbling for the right buttons to use.

Best Wireless Range: TP-Link Bluetooth Receiver

What We Like
  • Long range

  • Compact design

  • Multi-device connection

  • Auto connection

  • Auto on/off

What We Don't Like
  • No mounting options

  • No 12V power adapter

  • No voice assistant or call announcement

The TP-Link Bluetooth receiver is designed for use with both car and home stereo systems. It comes packaged with a mini-USB charging cable, 3.5mm AUX cable, 3.5mm AUX to RCA cable, and wall power adapter. You can use this unit with both iOS and Android devices, connecting two of them at once so you and your friends can trade playlists on road trips or safely take calls while driving. 

The device automatically turns on and off with your car, so you never have to worry about draining your car’s battery by leaving it plugged in overnight or while parked. It also automatically connects to your mobile device via a Bluetooth 4.1 connection, making it easy to set up each time you enter your car. The TP-Link receiver has a range of 66 feet, meaning that it won’t disconnect from your phone or tablet if you step away from your car for a bit. The slim, compact design makes it perfect for tucking away in your center console or armrest to keep it out of the way while driving.

Best Cassette Adapter: ION Bluetooth Cassette Adapter

What We Like
  • Auto on/off

  • Long battery life

  • Built-in mic

What We Don't Like
  • No voice assistant

  • Few on-unit controls

  • No multi-input

Whether you’re still rolling around town in an ‘87 Buick or just want to bring your vintage hot rod into the 21st Century, the ION Bluetooth cassette adapter is the right choice for you. The tape-shaped unit features a rechargeable battery that gives you up to six hours of use for streaming your favorite music or hands-free calling. 

It automatically turns on when you insert it into your car’s tape deck and shuts off when ejected. It will also automatically power off when it has been disconnected from your device for more than 15 minutes. The built-in microphone allows you to be heard crystal clear when answering phone calls while driving; it can also be tucked inside the unit to protect it from damage when not in use. There is also a button on the microphone that allows you to answer calls and play music with a single press.