This is the Back Up Battery For the Saflok Desklink Handheld Unit. With an output of 3.6V/2500mAh of power, it will keep your Desklink Unit Fully Operational.
SAFLOCK A28980 BATTERY SPECIFICATIONS:
Voltage - 3.6V
Capacity - 2500mAh
Chemistry - Ni-Mh
Dimensions - 50.16mm (1.97") x 17.16mm (0.68") x 50.8mm (2.00")
CS-811