Houselink® Key chain Transmitter 1. INTRODUCTION In this package, you will find a key chain transmitter with 12V alkaline battery. Model 1874 Challenge: Transmitter {Battery inside} PROGRAMMING TRANSMITTER TO THE RECEIVER Folio the instructions below to program transmitter into the receiver model 18R: Plug in the receiver into an electrical outlet, the red light on the receiver will be on. @ Press and hold the eam bunion on the receiver until the and of step 3.