The USB relay module features a stable USB to serial port chip and microcontroller. Serial port debugging software can be used on a computer to send commands for controlling the opening and closing of two-way relays. Onboard 8-bit high-performance microcontroller and CH340 USB control chip. Includes power LED indicator and relay status LED indicator. Supports relay switch status query. Equipped with two 5V, 10A/250VAC, 10A/30VDC relays capable of over 100,000 continuous operations. Features overcurrent protection and relay diode freewheeling protection. Color: Blue Material: PCB and electronic components Slight variations in printing may occur between batches; these do not affect functionality. Color differences may appear due to lighting or display settings. Package Contents: 1 x USB Relay Module Note: Other items shown are not included. Note: Lighting reflections and screen displays may cause slight color variations. Measurement error allowance is +/- 1-3 cm.