These are pre-built 433MHz wireless transmitter / receiver modules. They feature ASK encoding, and perform very well. They are ideal for devices using short data bursts such as remote controls, trigger pulses etc.

Specifications:
Output power: 3dBm.
Supply voltage: 3V.
Supply current: 10mA max.
Data rate: 300bps to 10kbps.
PCB measures: 18.5(H) x 14.5(W)mm (excluding pins).

Transmitter Module:  ZW-3100
Receiver Module:      ZW-3102