Honda 2008 Odyssey Owner's Manual page 156

Remote Transmitter
Replacing the Transmitter
Battery
If it takes several pushes on the
button to lock or unlock the doors
and the tailgate, replace the battery
as soon as possible.
Battery type: CR2025
150
To replace the battery, separate the
halfs by carefully prying on the edge
with a coin. Remove the old battery,
and insert a new battery with the
side facing up. Snap the two halves
of the transmitter case back together.
An improperly disposed of battery
can hurt the environment.
Always confirm local regulations for
battery disposal.
As required by the FCC:
This device complies with Part 15 of the
FCC rules. Operation is subject to the
following two conditions: (1) This device
may not cause harmful interference, and
(2) this device must accept any
interference received, including
interference that may cause undesired
operation.
Changes or modifications not expressly
approved by the party responsible for
compliance could void the user's
authority to operate the equipment.
This device complies with Industry
Canada Standard RSS-210.
Operation is subject to the following two
conditions: (1) this device may not cause
interference, and (2) this device must
accept any interference that may cause
undesired operation of the device.