1. LCD digital display is clear: real-time display of power, voltage, and temperature, intuitive and easy to read 2. Multiple alarm functions: automatic alarm for low voltage and over-temperature to safe use of electricity 3. Switchable temperature unit: supports ℃/℉ switching to adapt to different usage habits 4. Reverse connection protection design: prevents wiring errors from damaging the equipment, safe and reliable 5. Compatible with a variety of batteries: supports acid batteries, lithium batteries, lithium iron phosphate, nickel-metal hydride and other battery types Working voltage: DC 10-100V Voltage accuracy: ±0.5% Working power consumption: 8mA (maximum 10mA) Delay time adjustable: 10-120S (10, 20, 30, 60, 120 seconds adjustable) Sleep power consumption: 15uA (maximum 20uA) Temperature range: -19~80℃ (-2.2~179℉) Temperature accuracy: ±1 Over-temperature alarm adjustable: 0-79℃/0-179℉ (1 second interval beep after over-temperature) Temperature value flashing Low voltage alarm adjustable: 10.5-60V (1 second interval beep after low voltage) Voltage value flashing Beep volume: 60-70db Working temperature: -10~65℃ Product size: 52 x 52 x 14.2mm Opening size: 48.5mm Wire length: 30cm Color: Black Material: plastic Package Contents: 1 * Indicator 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.