Baby Audio Monitor TwoWay Talk Infant Intercom Wireless Night Light Home Security Device(Prise ) Condition: Item Type: Infant Sound MonitorMaterial: ABS+ Electronic Components Parent Unit Battery Model: lithium battery (included) Parent Unit Battery Capacity: 500mAh 1A The subunit does not contain batteries Sound Monitor Size: Approx. 10.5 x 7 x 5cm/4.1 x 2.8 x 2in(parent unit) Sound Monitor Size: Approx. 10.5 x 7 x 5cm/4.1 x 2.8 x 2in (sub unit) For best results, please charge the parent unit before use. After initial charge, charge normally as required. The parent unit can operate normally with the power adapter inserted into the device with the battery installed. 2. Press and hold the power on/off button of Shanda University for 2 seconds to turn on the parent unit. The power LED indicator will illuminate green to indicate 3. Once both the baby unit and the parent unit are opened. The parent unit will transmit the audio captured by the baby unit. 4. If there is no connection or you are out of range, the audio will be turned off and the parent unit will beep quickly after failing to re-establish the link. Move the parent unit closer to the baby unit until the link is re-established. 5. Press and hold down the power button to turn off the parent unit.