1 channel Relay module for OSOYOO STEM Kit for Micro:bit (model#2019011500)Shipping Policy | Refund Policy
A relay is an electrically operated switch. Many relays use an electromagnet to mechanically operate a switch, but other operating principles are also used, such as solid-state relays. Relays are used where it is necessary to control a circuit by a separate low-power signal, or where several circuits must be controlled by one signal.
Model#2019011500 or 2019018200