DMP 1142BC - Wireless 2-Button HoldUp Transmitter with Belt Clip.  The 1142BC Two-Button HoldUp Transmitter with Belt Clip is specifically designed to be worn on a belt when the belt clip is installed. Programmable LED feedback lets you know when Panic alarm has been sent. Includes one 3V lithium battery. (CR123A).  For use with: 1100 Series Wireless