The TrapLink Tester has an internal 9V PP3 battery, allowing any FieldTech receiver to be plugged into it and powered up. This saves you from having to connect the receivers to traps in order to pair them to the remote controls, and to easily test that all receivers are operational from the comfort of your home.
 
The unit also has a large green indicator light, which illuminates when you press fire on the remote control to confirm that the receivers plug is wired correctly.
 
No more running around a layout trying to configure everything in terrible weather.