2.4 GHz digital wireless transmission, stable transmission signal. Built-in microphone and speaker for two-way audio monitoring. High sensitivity, baby's cries are easily heard, and the light illuminates to inform parents. Easy pairing, plug and play. Place the transmitter approximately 1.5-2.0 meters from the baby. Both the parent unit and baby unit can be powered by DC 5V or 1.2V AA batteries (batteries not included). Volume adjustment. Two-way communication, supports data encryption. Receiver built-in microphones and speakers. Range in open space up to 250M. Plug type: EU plug, applicable to Indonesia, Germany, France, Spain, Italy, and so on. Color: White Material: Plastic Voltage: DC 5V Package Contents: 1 Set x Baby Monitor Note: Remove the battery or power plugs when not in use for extended periods. Do not use external power when using regular AA batteries, in case of danger. Rechargeable batteries can only be AA Ni-MH 1.2V; do not overcharge the battery, as this will reduce battery life when not in use for extended periods. Do not use at 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 +/- 1-3 cm.