Jack are using an NRF24L01 Wireless Shield and an NRF24L01 2.4GHz Antenna Wireless Transceiver Module to make a wireless switch remote control relay. And he is using the Arduino to control the NRF24L01 module.
ICStation NRF24L01 Wireless shield:
https://www.icstation.com/product_info.php?products_id=2835
NRF24L01 2.4GHz Antenna Wireless Transceiver Module:
https://www.icstation.com/product_info.php?products_id=1438
Post time: Jun-17-2017