Receiver: Frequency: Channel1: 2,414MHz Channel2: 2,432MHz Channel3: 2,450MHz Channel4: 2,468MHz Sensitivity: -90dBm Recording: Audio: WAV Samples per second: 64KHz AV recording: MPEG-4 Definition: 640 x 480, 320 x 240 and 160 x 128 Media player: LCD: 2.5-inch TFT LCD, 960 x high definition Movie: MPEG-4, AVI and ASF Audio: MP3 and WAV formats Picture: supports JPEG picture Output: Audio: stereo output Range: 20Hz to 20KHz Video: 75 and Omega, 1.0Vp-p, NTSC/PAL Input: Audio: stereo output Range: 20Hz to 20KHz Video: 75 and Omega, 1.0Vp-p, NTSC/PAL Earphone output: 16 and Omega/40mW, 32 and Omega/30mW maximum Inbuilt speaker: 8 and Omega/0.5W Memory: Built-in: 64MB Flash SD card: 2GB Languages: simplified Chinese and English Operation system: PC Windows XP Interface: USB 2.0 and 1.1 File system: FAT32 Power: Adapter: 110 to 240V AC/5V DC/1,000mA Battery: Battery: 3.7V/1,400mAh Li-ion battery Working time: charging time about 3.5 hours Wireless video recording time about 3.5 hours Media player about 3.5 hours Receiver Size (L x W x H): 106 x 72 x 22 Weight: net receiver: 110g Battery: 40g Working temperature: -10 to 50 degrees Celsius