This is the Battery Buzzer Low Voltage LiPo Battery Alarm from Hitec.
FEATURES: LED status indicator warns pilot when LiPo flight battery is low
Programmable voltage threshold allows advance warning to be set by
pilot
Protects model from unwanted landings and batteries from over-
discharging
High pitch warning sound
Ideal for all electric aircraft using LiPo batteries
INCLUDES: Battery Buzzer LiPo Battery Alarm, with Instructions
SPECS: Input Voltage: 7.4 - 16.8V
Battery Type: 2-4S LiPo
Voltage Select: 3.2V/3.3V/3.4V/3.5V ±0.05V
Net Weight: 0.39oz (11g)
Dimensions: 1.97 x 1.10 x .49" (50 x 28 x 12.4mm)
