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 and nightlight function.Specifications:Transmission Frequency: Ism 2400-2483MHzTransmission Power: 17dBmModulation Type: FSKPower Supply: DC5VPower Consumption: 70mAOperating Temperature range: -10anddeg -and60anddeg Storage Temperature: -40anddeg -and70anddeg Material: plasticBaby Unit: 62x40x111mmParent Unit: 62x45x111mm (with clip)Package Size: 20.5x14.5x9cm or 8.1x5.7x3.5inPackage Weight: 395g or 13.9ozPackage List:1 x Transmitter1 x Receiver2 x Power Cable1 x User Manual (English)