Features: This product is fully-functional, you can display the battery voltage, battery power, you can also-plug directly into the phone or other 5V equipment-charging. This product is suitable for all kinds of outdoor-power, mobile power, instrumentation-and other equipment additional battery power voltage display and additional USB to charge the phone and other functions. This product uses synchronous rectification step-down chip scheme, low heat, energy saving and environmental-protection. This product is-compact in structure, making full use of space and reducing-costs. Can be used as battery voltage meter, battery capacity tester and temperature indicator panel for car, marine, boats, etc. Specifications: Material:Plastic Size:Approx.6.14x3.34x1.35cm/2.41x1.31x0.53inch Voltage measuring range: DC8V-100V Display mode: LCD screen Working temperature:-10-+70℃ Working pressure: 80-106kpa. Package Includes: 1x Battery Capacity Indicator note: ①.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. ②.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.