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The Yeah Racing (#YE-0014) Low Voltage Buzzer for 2S/3S/4S Li-Po Battery available @ yeahracing.com Specification:
# Measure 2S/3S/4S Li-Po battery
# Prevent the Li-Po battery damaged from low voltage
# Buzz with red LED if Li-Po cell drops below 3.3V
# Reverse polarity protection
# Usefull for Air-RC while the LED cannot be seen
# Compact in size: can be put in micro-heli or other models
# Light weight (6.3g)
# Dimensions: L38.0 x W24.5 x H11.0 (mm)