Power supply: 5V DC(battery/power adaptor) 1. The digital display meter can display the instantaneous flow, unit is L / min 2. Can display cumulative flow, unit is L, max is 9999L. 3. It can show temperature of enviroment or fluid. White background light LCD.Flow sensor connecting type: on the flow sensor : Plumbing Measurement Range: 10-300 Model Number: US211M Lite HS20TA Coupling Type: Male BSPP Thread Battery life span: 1 year(for those lower consumption hall flow sensor) Function: Show flow rate Show volume Show temperature(Celsius / Fahrenheit) Show working time(Day) Power input: 5V dc OR 3 AA battery Accuracy: +-1% Temp Display range : -20 -99 celsius Flow sensor working temperature: 0-60 celsius Flow Range: depends on the flow sensor Working Pressure: 0.05-0.8MPa colour:Black, blue Material:plastic size:84 * 66 * 34mm Installation Dimension:78*60mm Joint Pipe Bore Size: 2 inch Package Contents: 1*US211M Lite digital display 1*-HS20TA 2 inch hall water flow sensor Low consumption version (battery and temperature sensor are not included) Note: This flow meter can be used as pressure meter, note: 1.Pressure meter and flow meter can not work . 2. US211M lite can work with all of hall flow sensor. with battery power supply, to use with LOW CONSUMPTION FLOW SENSOR, battery can last for 1 year. with other flow sensor, battery can last only one week, unless you use AC to DC power adaptor. 3. To work as pressure meter, you have to AC to DC power adaptor for long time usage. Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.