1. Onboard 8-bit high-performance microcontroller chip 2. Onboard CH340USB to serial port control chip 3. Onboard serial port receiving and sending indicator and relay status indicator 4. Support relay switch status query, query : OXFF 5. Onboard 16-way 10A/250VAC, 10A/30VDC relays, long relay life can be continuously attracted 100,000 times Power supply voltage: 12/24V Output type: relay switch signal The module has overcurrent protection and relay diode freewheeling protection function Name:Relay module (The product appearance and printed words depending on the batch, but this does not affect use) Material:PCB Color:Blue Package Contents: 1 * Relay Module Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.