This post was done in partnership with The Wirecutter, a list of the best technology to buy. Read the full article below at TheWirecutter.com
If you want Bluetooth in your car but don't want to spend the money and/or time to install a new head unit, you have three options, depending on your car's setup and whether your priority is making phone calls or listening to music. If your car has an aux-in (headphone-jack) setup, we recommend iClever's Himbox HB01 ($30). If you don't have an aux-in port and value call quality over sound, Motorola's Roadster 2 ($80) clip-on speakerphone is the best pick. If you don't have an aux-in jack, and music quality is more important for you than phone calls, get the Mpow Streambot Y FM transmitter for $37.
We spent 20 hours researching the latest version of this guide, comparing 10 new units to the 11 we originally tested, to find the best in each category. If you'd like to dig in deeper into what features to look for in a kit, how to deal with whiny audio cables, or you simply want additional picks besides the three mentioned here, visit our full guide.
How we decided
The most important thing we looked for when testing was ease of use and how close each kit came to a built-in-Bluetooth experience.
The most important thing we looked for when testing was ease of use and how close each kit came to a built-in-Bluetooth experience. With that in mind, we set out to find the most promising candidates for each of the three types of kit. For aux-in kits, we eliminated any that required you to use your car's accessory-power outlet for power without also including a USB charger with at least 1-Amp output for charging a phone at the same time; we also eliminated any that didn't have phone-answering functionality, as well as those that had downright awful user reviews. For speakerphones, we focused on units with FM-transmitter capabilities, native voice commands, and the capability to auto-pair. Finally, dedicated FM transmitters were easier to narrow down because not many people make them anymore, and few have positive reviews; we tested only the ones that earned high ratings.