3.7-30V 1-8S Lipo/Li-ion/Fe Battery Voltage 2IN1 Tester Low Voltage Buzzer Alarm Specification: . Use for 1-8S Lipo/Li-ion/LiMn/Li-Fe . Voltage detection precision: +_0.01V. . Unit voltage display range: 0.5~4.5V . Total voltage display range: 0.5~36V . 1S test mode voltage range: 3.7~30V . Low voltage alarm mode for 2-8S . Alarm set value range:OFF~2.7~3.8V . Size: 40mm x 25mm x 11mm . Weight: 9g . Package including : . 1pcs buzzer alarm .