Guangzhou Si Bao Jian Electronics Co. Ltd. BM148TX ユーザーズマニュアル

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3. Non-rechargeable battery is not to be recharged.

4. Rechargeable batteries are only to be charged under adult supervision.

The Parent unit start to charging after you have installed the Parent unit battery 

and connected the Parent unit to AC power. 

1. Use only the AC Adapters which are included in the package, plug into any 

nearby standard household electrical outlet.  

2. Once connect them with the Parent units, charging automatically begins. 

3. The charging time for completely charging empty battery takes 8 hours when 

the unit is turned off.