HBX 903A VANGUARD Upgrade Alarm Parts for the Battery,Can test whether your battery has enouth power.

HaiBoXing HBX 903A VANGUARD Parts Upgrade Alarm for the Battery,You can hear the Alarm in 50 meters distance. You can freely set the alarm voltage value. With this upgrade tool, you can predict the remaining battery power in advance.

This parts is for HaiBoXing HBX 903A VANGUARD RC Truck.HBX 1/12 RC Monster Car

if you want to buy more parts for this RC car,
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HBX 903A VANGUARD Parts