Indicates that "Press-to-talk" mode is on(page 15).Indicates that the doorphone's LED lightsare on (page 21).3.3 Battery installation– USE ONLY rechargeable Ni-MH batteries AAA (R03)size.– Do NOT use Alkaline/Manganese/Ni-Cd batteries.– Confirm correct polarities ( , ).Note:R Use the supplied rechargeable batteries (Ni-MHONLY). For replacement, we recommend using thePanasonic rechargeable batteries noted on page 4.R Wipe the ends of batteries ( , ) with a dry cloth.R Avoid touching the ends of batteries ( , ) or theunit contacts.3.4 Charging the sub monitorOnly connect the charger with the supplied PanasonicAC adaptor (page 3).AC adaptor connectionsA*1B*1 Press plug firmly.R Connect the charger to the power outlet, and thenplace the sub monitor in the charger to charge it.Charging usually takes about 8 hours.A Charge indicator– when charging: lights– when charging is completed: offB HookR Charging may take longer in the following situations.– When the operating temperature is low(page 29).– When the sub monitor is picked up off the chargeror used during charging.– When the sub monitor’s signal is out of range( ) (page 12).R The sub monitor does not overcharge even if it iscontinuously placed in the charger.Battery levelIcon Battery levelHighMediumLowNeeds chargingR See page 29 for a guide on operating times for thesub monitor.Note:R When the sub monitor is off the charger or the ACadaptor is disconnected for 1 week or more, removethe batteries in order to maintain battery performanceand prevent the batteries from discharging.– Recharge the batteries before using the submonitor again.3.5 Wall mountingNote:R Make sure that the wall and the fixing method arestrong enough to support the weight of the unit.R Drive the screws (locally procured) into the wall.25 mm133. Preparation