WLEXITDX - Exit/Entrance delay transmitter
datasheetprice each: $70  
Specifications
Dimensions 4.2" L x 1.6" W x 0.8" H (107x41x20mm)
Power two 3V DL-2032 Lithium Batteries (supplied)
Current Consumption 7 mA average while transmitting
Battery Life five years typical
Measured Range 500 feet minimum in open air (four quadrant test)
Accesories belt clip and pocket clip (supplied)
Operating Frequency 315 MHz