1、When the noise in the baby room is lower than 40db for more than 20 seconds, vox will be activated and the display will eliminate slight background noise. 2、Until the noise exceeds 40db, the monitor will be awakened and it accurately lets you know when your baby makes any sound. 3、Two-way intercom, 2.4GHz dedicated signal, standby up to 20 hours. 4、Convenient to carry, the parent unit can be charged and carried, 1000ft outdoor/160ft indoor. 5、The night light can be remotely controlled, making it more practical and convenient to use. Condition:100% Brand New 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. 2 x Sound Monitor 2 x USB Cable 1 x Plug 1 x Manual