RCA WHP175 - Manual (Page 6)

RECHARGING CRADLE/TRANSMITTER
The recharging cradle/transmitter acts both as the transmitter of the signal
to the headphones as well as the recharging base.
Off indicator:
incorrect
recharge
On indicator:
correct
recharge
BACK
Power on indicator Charging contact
AUDIO IN
input jack
Channel selection control 1, 2, 3
DC IN power supply socket
RECHARGING THE HEADSET
To recharge the headset unit, place the headphones into the recharging
cradle/transmitter with the charge indicator facing to the front.
It is important that the headphones are placed in a completely vertical
position, not leaning to either side. If the headphones are placed
correctly, the charge indicator light on the headphones illuminates.
FRONT