RC Model LiPo Battery Voltage Indicator Tester Voltage Display Viewer for YUNEEC Q500 H480 3S/4S and Typhoon H Batteries Voltage Tester for Q500/H480/Typhoon H Batteries Enjoy the ability to check your battery level at any time! Great convinience of being able to check the battery voltage now with NO NEED to do it as usualplug the battery into the quadcopter and turn on the quadcopter and check the battery voltage NOTE: Package includes 1pc voltage tester only, batteries NOT included WARNING: Don't plug the voltage tester into Q500/Typhoon H & H480/Typhoon H batteries at same time, or else it may cause battery damage and we won't be responsible for it!