One uses your existing switch and eliminates the cable reel only.
The other uses a contactless magnetic switch to eliminate all failure.
Both systems eliminate failure in the cable reel from corrosion, loose springs and physical damage.
The magnetic switch is immune to mechanical failures and water damage.
OEM can save on cost by removing brackets, wire guides, and associated labor.
900MHz FHSS/2.4GHz DSSS
Transmitter – 2 C-sized Alkaline
Receiver: 9-30 VDC
Four conductor 18ga. cable