Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Transmitter Battery Replacement




1. Insert a flathead screwdriver into the notch of the transmitter.
2. Remove the cover by using the screwdriver as shown.
3. Install the new batteries with the ~ side facing up.

Battery specification: Lithium CR 2025 x 1

4. Install the cover.

NOTE: The batteries will last about 2 years when used 10 times a day.