Fangrui Product Details Voltage Tolerance: +/-0.1v Application Fields: 6-60v Storage Battery Size: 81 X 54 X 18mm Using Method: Set Starting Voltage:in Normal Display Voltage State,press The Button Will Display Start Charging Voltage;long Press For 3s The Digital Tube Will Flash;you Can Start Or Stop Button To Set Starting Up Charge Voltage Value Set Stop Voltage:in Normal Display Voltage State,press The Button Will Display Stoping Charge Voltage;long Press The Button For 3s The Digital Tube Will Flash;you Can Start Or Stop Button To Set Stoping Charge Voltage Value Factory Reset:in Power On State Press The Start/stop Button At The Same Time,digital Tube Will Display 888;that Represents Factory Reset Settings Colour: Blue Material: Pc+metal Package Contents: 1 X Battery Charger Control Module Only The Above Package Content, Other Products Are Not Included. Note: Light Shooting 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 +/- 1-3