EF055B Works with iPod， MP3 player， PC， laptop， PDA， CD player， cassette player， etc. Digital LCD display with blue backlight is to display FM frequency. Frequency channels to choose from: 87.5 to 108.0 MHz， 0.1 MHz/step increase or decrease. Powered by 2 AAA batteries (not included) or 12V DC car adapter (included). FM Transmission Mode: Stereo. Audio Frequency Response: 20Hz - 20KHz. FM Transmission Frequency: 87.5 to 108.0MHz. 10 Memory Channels. Separation: > 50dB. Operating Currency: 50mA. Power Input: 2 AAA batteries or car adapter. Package Details Weight: 63.13 g Size: 9*4*2 cm Package Includes 1 × LCD FM stereo transmitter 1 × Car power adapter cable