Battery Replacement
The transmitter has two 3 volt batteries, which can be removed and replaced without special tools. First, release the key from the closed position; then insert a coin in the side slot of the transmitter and twist. The cover should separate from the body of the transmitter where the batteries are stacked on top of each other. The batteries are available at local retail stores. Recommended replacement batteries are Panasonic(R) CR 2025 lithium or equivalent. Battery life for normal use is about two years.
NOTE:
The transmitter MUST be reprogrammed after the batteries are replaced.