1 4 Ways: Onboard power LED indicator and relay status LED indicator 4 Support relay switch status query, query instruction: 0xFF. 2 Smart Chip: Wireless relay module onboard 8 bit high performance microcontroller chip, onboard CH340 USB to serial control chip. 3 Protection Function: Relay module has the functions of transition protection and relay diode freewheeling protection. 4 Long Lifespan: Onboard 4 5V/10A/250VAC, 10A/30VDC relays, lifespan up to 100,000 times, can be used for a long time. 5 Multiple Power Supply Support: USB relay module supports USB power supply, external power supply switching, easy to use.
What's in the box
1 x Relay Switch
