Gravity: Serial Data Logger for Arduino - 

TEL0147 is a Gravity: digital wireless switch kit - transmit and receive. Based on 433Mhz RF communication technology, the module includes a transmitter and receiver and features the advantages of simple operation, strong penetration, and ultra-low standby power consumption. It is able to transmit digital signals and compatible with any controller that can read and write digital signals. These modules are used on a wide variety of applications that require wireless control, such as, remote control, wireless doorbell, wireless signal transmission, upgrading wired buttons to wireless buttons, etc.