GB Bullet Points: 1LED Display: FM transmitter with LED display window. Frequency and voltage can be displayed. 2Bluetooth Button: Bluetooth start/stop button, stereo music playback. can answer/hang up/reject/resend via Bluetooth. 3Support U Disk: Support the use of U disk to play music; and support MP3/WMA music format, with call ec ho cancellation and noise reduction (CVC) technology. 4USB Output Voltage: Can provide voltage up to 5V/2.5A to other devices; With car battery voltage display. 5Automatic Memory Function: Automatic memory function of power failure frequency point, line audio input function, versatile and powerful. Description: This product is powered by a cigarette lighter. It has a variety of functions and is well-made, durable. Welcomes everyone to experience. Specification: Name: G7 Car Kit Bluetooth Hands-Free FM Transmitter Material: ABS + electronic components Color: black, silver Size: about 10*8*2.5 cm/3.94*3.15*0.98in Packing List: G7 Bluetooth Transmitter*1 Note: Due to the lighting effects and shooting angles, there is color difference in the product, please understand. Due to manual measurement, there is a tolerance in the product size.