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.VOX function. With 2-way talk , music and nightlight function.Specifications: Transmission Frequency: Ism 2400-2480MHzTransmission Power: 17dBmModulation Type: FSKPower Supply: DC5V 1ABattery: 3 * 1.5V AAA (not included)Power Consumption: 70mAOperating Temperature range: -10~+60Storage Temperature: -40~+70Material: plasticBaby Unit: 62*35*111mmParent Unit: 62*42*111mm (with clip)Package Size: 17.3 * 15.6 * 7cm / 6.8 * 6.1 * 2.8inPackage Weight: 285g / 10ozPackage List:1 * Transmitter1 * Receiver2 * Power Cable1 * User Manual (English)