The retract is very easy to handle and it works like a standard servo which means you do not need any other electric equipmrnts to operate the retracts. All what you need is to connect the retract to your receiver. If you want to use two retracts or three retracts (depend on your airplane) in your airplane, you need just to ues Standard Y-Cable and connect all retracts to one channel. This retract has also Auto-Off safe mode. If the retract can not open or close complitly it will switch off after 10 Sec. to save the battery during the flight. In this situation you need only to Close/Open the retract one more time. This model is the version 2, which has metal parts inside to fix the landing gear. Please never use over 6V to operate the retract.