This Battery Monitor is designed to monitor performance most kind of battery systems with capacities of up to 9999 Amp hours. Read your battery bank like a fuel gauge, battery Status at a Glance. Combines many functions in one, these information leads to more efficient use of the battery, which can enhance battery life and reduce the risk of failure. It selectively displays voltage, charge and discharge current, power consumption in watts, remaining battery capacity in Ah and percentage, and the time remaining of your battery bank. It is equipped with an internal programmable alarm, high/low voltage and low capacity programmable alarm. Universal Battery Monitor - it can measure battery (bank) voltage range 10V-120V, currents up to 500 Amps, capacity up to 9999 Ah. Specifications Working voltage: 10.0-120.0 V Current range: -500~+500 amps Capacity range: 0-9999 ampere-hour Working consumption: 10.0-15.0 mA Standby consumption: 1-2 mA Voltage accuracy: ± 1.0 % Current accuracy: ± 1.0 % Capacity accuracy: ± 1.0 % Size: 100mm*61mm*17mm Panel cut-out: 94mm*57mm Packsge includes 1 x Battery monitor 1 x Shunt 500A 1 x 20 feet cable 1 x 3 feet B.cable 1 x English operation manual