... devices. Product Features: l 12 Channel Receiver (JS12N) receives sensing information from sensor units (such as wireless wall switch, window contact, and ... modules may control up to 4 channels, so total 12 channels can be controlled by a receiver.l The receiver ... 1 “PC Link” LED, 1 “RXD Radio” LED, 1 USB port , 1 Output Selection KnobAntennaExternal receiving antenna with magneticholding (included in ...