Features:OOTDTY1. Check the working status of the lithium battery. Protect the battery from overcharging or over-discharging.2. Compatible with 1-8S Lipo/ Li-ion/ LiMn/-Fe battery. The pin space is about 3mm (about 0.12 inch old). Simple pin. Specifications:Voltage Detection Accuracy: 0.01V Unit Voltage Indicator Range: 0.5V-4.5V Voltage Indicator: 0.5V-36V 1S Test Mode Voltage Range: 4V-15V Low Voltage Mode: 2-8S Alarm Set Value Range: OFF-2.7V-3.8V Measurement: 40x2 4mm/1.57x0.94" Quantity: 1 PcNote: Please allow 1-3mm error due to manual measurement. Pls make sure you do not mind before you make a bid, due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!No Retail Package Package Included:1x2 in 1 Tester Low Voltage Audible Alarm