2.4GHz wireless mobile recorder 4-channel palm wireless mobile AV camera & receiver MP3, MP4 player 960*240 pixels 2.5TFT LCD ... -in rechargeable lithium battery Built-in microphone for audio monitoring Provides images/video compression and storage Motion ... frequency: ISM 2,400 to 2,483MHz CH1=2,414MHz, CH2=2,432MHz CH3=2,450MHz, CH4=2,468MHz Sound modulation: 6.0MHz Operating ...