2.4 GHz digital transmission for a stable signal. Built-in microphone and speaker for two-way audio monitoring. High sensitivity; crying is easily heard, and a light alerts parents. Easy pairing, plug and play. Place the transmitter approximately 1.5 to 2.0 meters from the baby. 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 with data encryption support. Built-in microphones and speakers in the receiver. Open space transmission range up to 250M. Plug Type: EU Plug, applies to Indonesia, Germany, France, Spain, Italy, and so on. Color: White Material: plastic Package Contents: 1 Set x Baby Monitor Note: Remove the battery or unplug from the power supply when not in use for an extended period. Do not use an external power supply when using regular AA batteries, as this is a hazard. Rechargeable batteries can only be AA Ni- 1.2V batteries. Do not charge the battery to reduce its lifespan when not in use for an extended period. Do not use in high temperature or high magnetic fields. Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture to be slightly different from the real thing. The permissible measurement error is +/- 1-3 cm.