System: PAL/NTSC Receiving Frequency: CH1: 2.414GHz CH2: 2.432GHz, CH3:2.450CHz, CH4: 2.468GHz Receiving sensitivity: -88dBm Video output level: 1Vp-p Audio output level: 1Vp-p Video format: MPEG4, MJPEG Recording Picture Resolution: 640x480 Pixel(max) Memory: Built-In 128MB memory Signal-to-noise ratio: higher than 85dB Display screen: LCD screen, 2.5 inches, 960x240 resolution Capacity of memory: supports the SD card SDHC with capacity up to 16GB Language Support: English, Chinese, French, Portuguese, Italian, Spanish, Dutch, German, Russian Charging time: 4 hours Playing time: 2.5 hours for normal play, and 2hours for playing monitoring image. PC interface mode: USB2.0 Support computer system: Win98SE/ME, Win2000, Win XP File transmission velocity: Bus writing velocity>6MB/s, reading velocity>7MB/s(for operating system only) Software update: supported Measurement Size: 51.5 x 38 x 36mm Weight: 700g Power supply: built-in lithium battery, power adapter Supply voltage: 5V/ 250mA-550mA