Features: It has a voltage detection channel, a set of relay switch output(normally open and normally close), the time relay can be controlled by voltage detection to achieve a variety of functions. Can be used in voltage monitoring, charging and discharging control, overvoltage and undervoltage protection and other fields.Parameters: A Set of Conversion: normally open and normally close Contact Load: NO: 30A/250V AC or 30A/30V DC NC: 20A/250V AC or 20A/30V DC *Attention: because high voltage DC electric arc damages relay contact, so the electric load above DC 60V load current is less than 10A. Contact Resistance: ≤ 100mΩ (1A, 6V DC) Mechanical Durability: 10 millions Electricity Durability: ＞ 100,000 (10A to 250V AC) Set display off, the minimum current value is 4mA/24V(relay open). The settings automatically saves after power off.Specifications: Material: ABS Color: Blue Output Timer Range: 0 to 999 seconds (when the voltage reaches the set value, relay will delay to open or close) Detection Samping Delay: 0.1 to 0.9 seconds (detection sensitivity) Voltage Detect Range: DC 0 to 99.9V, error: ±0.1V Voltage Upper and Lower Limit Adjustable: DC 0 to 99.9V Operating Power: DC 6 to 80V (60V battery at maximum) Item Size: 9.4*5.2*3cm / 3.7*2.04*1.18in Package Size: 9.5*6*3cm / 3.74*2.36*1.18in Package Weight: 92g / 3.24ozPacking List: 1 * Voltage Relay 1 * User Manual(English)