Features: 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. Position the transmitter at a distance of about 1.5-2.0 meters from the baby. Open space transmission range up to 250M. function. With 2-way talk , music and nightlight function. Specifications: Transmission Frequency: 2400-2480MHz Transmission Power: 17dBm Modulation Type: Power Supply: DC5V 1A Battery: 3 x 1.5V AAA (not included) Power Consumption: 70mA Operating Temperature range: -10C~+60C Storage Temperature: -40C~+70C note: Neutral Material: plastic colour: white blue Package Contents: 2 x Baby Monitor intercom 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.