2.4GHz digital wireless transmission, stable transmission signal. Built-in MIC and speaker for two-way audio monitoring. High sensitivity, the crying voice is easy to be heard and the lamp will turn on to inform parents. Easy pairing, plug and play in. Position the transmitter at a distance of about 1.5-2.0 meters from the baby. Both parent unit and baby unit can be powered by DC 5V or 1.2V AA battery(Batterise is not included) . Volume adjustment Two-way intercom, support for data encryption Both the receiver have built-in microphones and speakers Open space transmission range up to 250M Plug Type: EU Plug, it applies to Indonesia, Germany, France, , Italy and so on. Colour: White Material: plastic Voltage: DC 5V Package Contents: 1 Set x Baby Monitor Note: Please take out the battery or power plugs when you do not use it for a long time. Please do not use external power supply when you use ordinary AA batteries,in case any danger. Rechargeable batteries can only be 1.2V AA Ni- battery,please do not charge the battery in case reducing battery life when you do not use it for a long time. Please do not operate in high temperature and high magnetic field Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.