This Wireless Battery Monitor is designed to monitor performance most kind of battery systems with capacities of up to 999 Amp hours. The unit continuously monitors voltage, charge or discharge current, number of power, prevent over charge or over discharge, these information leads to more efficient use of the battery, which can enhance battery life and reduce the risk of failure. Read your battery bank like a fuel gauge. Battery Status At A Glance. Charging status indicator, looks like a smartphone. Combines many functions in one, Dual display Voltage (V), Current (A), Capacity (AH) Power (W/KW), Energy (KWH) Temperature (C), Working Hours (H) By turning External device/Relay on and off, it can control external devices, such cut off Power input. Trigger external Relay (Not included) when the reading reach preset value. [OVP] Over Charge Voltage protection [] Over Discharge Voltage protection [OCP] Over Discharge Current protection [NCP] Over Charge Current protection Come with a Through-hole Current transformer, it doesn' require shunt. The current sensor can be placed on the Positive or Negative side of power. Reverse polarity protection. Doesn' require isolated power, self-powered 6-80V. Nondestructive installation, it is very easy to install. Used in cars, boats, motorcycle and Testing Devices for measuring voltage and current, Ah etc. Battery Protection, Prevent Over Discharge/Over Charge. Used for Solar, Wind, HHO System DIY battery discharge device. Solar, Wind, HHO System Colour: black Material: plastic+metal Package Contents: 1 * 2.4 inch LCD Display (Receiver) 1 * Measuring module (Emitter) 1 * Hall sensor 3 * Cable 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.