The Programming Key and Manager Key use 4 premium alkaline AAA batteries.
Remove the 2 screws from the cover plate with a #1 Phillips screw driver.
Slide battery cover plate back and lift up to expose the batteries.
Remove the batteries from the housing. Replace with four premium alkaline AAA batteries.
Replace the cover plate and secure with the screws.
CAUTION: Risk of explosion or leakage if battery is replaced by an incorrect type, mixed with a different battery type, or inserted backwards. Replace all batteries of a set at the same time. Be sure to insert batteries with correct polarities. Remove exhausted batteries from product promptly and dispose of used batteries according to the battery manufacturer’s instructions.