FM transmitters
FM transmitters send music, podcasts and sat nav directions from your phone to the car radio, even in cars without Bluetooth or an AUX input. They plug into the cigarette lighter socket or a USB port, and most models support hands-free calls while charging your phone through USB and USB-C ports.
FM transmitters
Your phone pairs with the transmitter over Bluetooth, and the sound is broadcast on a free frequency in the FM band from 87.5 to 108 MHz. Tune the car radio to the same frequency. If you hear static, try another frequency that no local station uses. The built-in microphone allows hands-free calls.
Most models also work as a car charger with USB and USB-C ports. More powerful versions support fast charging of up to 30 W over USB-C. The transmitters also play music from a USB flash drive or microSD card, and some support lossless formats such as FLAC and APE.
Before buying, check whether the socket in your car supplies 12 V or 24 V – 12 to 24 V models also suit vans and lorries. Set the frequency and volume before you set off, and while driving only use the button for answering calls. If the socket stays live after the engine is switched off, unplug the transmitter when parking for longer.
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