The 5816 is Honeywell's #1 Selling Wireless Transmitter with a Proven Track Record of Stability and Performance. 

Two zone wireless transmitter with both built-in magnetic reed switches and wired closed circuit contact loop.

Dimensions: 3-1/16" H x 1-9/16" W x 1-3/16" D

CONTENTS:

5 x 5816WMWH Transmitters 

5 x CR123 3V Lithium Batteries

NOTES: All sensors have been tested and are properly functioning. CR123 3v lithium batteries are included. They will be of various brands. Four out of five STAR rating.