Product information: Color: Black Backlight color: Green Screen size:61.3mmx33.3mmx13.5mm/2.41''x1.31''x0.53'' Voltage range: 6-63V Circuit load current: 5 - 6mA Suitable for: 3-15pcs 3.7V Lithium Batteries; Lead Acid Batteries 12V, 24V, 36V, 48V; Fe Batteries Dimensions: 61.3 x 33.3 x 13.5mm / 2.41"" x 1.31"" x 0.53"" Mounting hole Size: 58 x 28.1mm / 2.28"" x 1.11"" Wire Length: 30cm / 11.8"". Contents in Box: 1 x Battery Capacity & Volt Tester 1 x Cable More information about product: Waterproof shell with a button for switching from Capacity, Voltage and Turn off the screen. Monitoring the battery capacity and voltage by this mini tester. Easy to read the value in dark environment with the green backlight. Automatically turn into sleep mode in 10s for saving the power. Suitable for testing the capacity of 3.7V Lithium Batteries, Lead Acid Batteries and Fe Batteries. Simple connection with reverse protection, won't burn if connect reversely. For checking the remian capacity of batteries, diretly display with battery capacity sign and percentage. Widely used for cars, motorcycles, scooters, bikes, power bank, test equipment, etc.