1. Make sure the unit is turned Off.

2. Find the battery cover located on the bottom of the unit, use a screwdriver to loosen the screw and open the battery cover.

3. Remove old batteries by pulling up on one end of each battery.

4. Install 4 new AA (AM-3/LR6) batteries following the diagram inside the battery box. (For best performance, alkaline batteries or fully charged Ni-MH rechargeable batteries are recommended.)

5. Replace the battery cover and tighten the screw to secure.