Used for monitoring the voltage of 4 & 5 cell receiver batteries in any kind of R/C model, the Venom Battery Monitor is compact, lightweight and a snap to install. Weighing in at just 0.2oz / 5.7grams, the Venom Battery Monitor can be switched between 4.8 volts and 6.0 volts and features eight mini-LED lights indicating current battery voltage. KThe unit plugs directly into any available Receiver Channel or can be plugged in line with a servo using a Y-Harness.now when your battery is going dead before it's too late.