Feature: 1. 5V 2 channel self-locking relay module with high reliability. 2. Made of high quality material with stable performance, durable. 3. Practical relay module, easy to install and convenient to use. 4. High accuracy and strong stability, practical and safe to use. 5. Trigger mode is low pulse trigger, more reliable and convenient. Specification: Condition: 100% Brand New Item Type: Relay Module Material: Metal Working Current: 1 relay pulls in 70MA, 2 relays pull in 140MA Static Working Current: 0.2mA Trigger Mode: Low Level Trigger Pin Description: V: Power positive G: Power negative and trigger signal ground terminal; T (T1/T2/T3/T4): Trigger signal input (0.2-2s low pulse) NO: Relay normally open port COM: Relay common port NC: Relay normally close port Instructions: When the power is turned on, the relay is turned off. Click the trigger port (T1/T2/T3/T4 port) to pull in relay (and hold), click the relay again to disconnect, and so on.. Package List: 1 x Relay Module