This is the SeeedStudio Codec-Adaptive Wireless Relay. A wireless relay is a codec-adaptive RF receiver with single channel relay. It helps easily deployment of wireless AC control for electrical appliances.
Features:
Max 30 difference codec, unlimited controller or transmitter of each codec
Adaption of most popular RF remote controller, except rolling code
Purchased these to attach to my Light-O-Rama servos controller, that I use for building holiday displays, including animated figures. These relays perfectly interface with my servo controller, and will be used to trigger opening/closing of a curtain rod.