Multi Function: Supports with 21-keys IR remote control, everyone in car can control music playing and calls . Supports hand-free calling and can display incoming phone number and music name and broadcasts phone number automatically . Supports bluetooth stereo output mode. Power off memory,it remembers the last music when power off and starts from it again when power on.Fifth:cvc noise cancellation.Sixth: full duplex communication. Specifications: Rated voltage: 12~24V Limited voltage:9V-26V Format:MP3 WMA Working temperature: 0~60 SNR: >60dB FM Trans. FRQ:87.5-108Mhz Bluetooth Version: Version 2.0+EDR Bluetooth transmission distance: Frequency range:87.5-107MHZ Package Contents: - 1 x FM Transmitter - 1 x 3.5mm cable - 1 x remote controller - 1 x User Manual BT car mp3 fm transmitter