Power Supply: 13.8V-14.8VRelay closing voltage: 12.4VRelay off voltage: 14.8VVoltage error:±0.1VVoltage detection: DC voltmeterCharging type: 12V batteryPotentiometer adjustment: RP1 RP2 (carefully adjusted)PCB Board Size: 65mm x 52mm x 30mm / 2.56" x 2.05" x 1.18" (L x W x H)Note:1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you!2. Please allow 0.5-1cm measuring deviation due to manual measurement.1 cm = 0.3937 "