Add another dog to your current SportDog UplandHunter Add-A-Dog Collar Receiver or replace a lost or broken beeper collar receiver with the SDR-BEEP receiver, the original collar receiver for the UplandHunter 1850. If you own a SportDOG Brand UplandHunter 1850, the transmitter will operate all training collar and beeper functions remotely and allow you to run a second dog. If you own a SportDOG Brand SD-1800, SD-2000 Camo, or SD-2500 system, your transmitter will operate the training collar and the remote locate or "call" function on the beeper.