RCA WHP140 Owner's Manual page 6

INSTALLATION (continued)
Step 4:
Placing your thumb on the Battery Compartment Cover on the left
side of the headphone, gently push up in a sliding motion to remove
the cover. Then insert the 2 "AA" size batteries into the battery
compartment, carefully following the markings inside to assure the
batteries are inserted properly with the + and – ends in the correct
position. Then slide the battery cover into place until the tabs lock
to secure it in the proper position. Then locate the Power ON/OFF
Switch and slide it to ON.
*Note: You may use nickel-cadmium or nickel-metal hydride
rechargeable batteries to operate the headphones. However, they
may not be recharged in the headphones. Use your charging device
with the batteries to recharge them.
Do not mix batteries with different chemistry types (for example, a zinc
battery with an alkaline battery). Do not mix new and used batteries.
Do not leave batteries installed in the product when not in use for long
periods.
POWER ON/
OFF sWITCH

RIGHT SIDE
CHANNEL
TuNINg
THumBWHEEL
LEFT SIDE
DuAL
COLOR LED
INDICATOR
vOLumE
CONTROL
KNOB
BATTERy
COmPARTmENT
COvER