Hello

Sensor switch is a great product.

Plug one of the plugs into the usual battery socket on your Rx, plug the second plug into any spare channel socket 6-7-8 etc.

The batteries plug in as usual, as long as you always plug the batteries in the correct polarity blue=black.
If you have red JST connectors on you battery they still fit the PB socket as they are 2/3 a standard socket

Any more help you can phone 01923 270405

Dave Wilshere