Q-SEE QSDT304C2 2 Pack Digital Wireless Camera and Receiver Digital 2.4Ghz Digital Wireless Technology MJPEG Format Compression Supports up to 4 Cameras Simultaneously Displays Cameras all at once, one at a time, or one at a time in sequence Supports A/V output from receiver Supports Channel Pairing to avoid interference from other devices Supports AE and AWB Transmission distance up to 300 ft