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Features:2.4GHz digital wireless transport, stable transfer signal.Integrated into the Military Manufacturing Authority and loudspeaker to monitor the sound in one direction, with the function of the night light.High sensitivity, crying sound is easy to hear and inform parents.Adoption of the frequency of the spread of the spectrum (FHSS), combating intervention and sound clarityPlace the transmission device at a distance of about 1.5-2.0 meters from the child.The range of open space is up to 250 m.Specifications:Record frequency: ISM 2400-2480MHzRecitation power: 17dbmForm type: FSKEnergy supply: built -in lithium batteryOperating temperature range: -10 degrees ~ + 60 degreesStorage temperature: -40 degrees ~ + 70 degreesMaterial: plasticChild Unit: 13*9.7*3.5cmMother Unit: 13*9.7*3.5cmPackage size: 14*10.5*10cm/5.5*4.1*3.9inPackage weight: 212g / 7.5OzPackage menu:1 * Transmission1 * The recipient2 * Energy cable1 * User guide (English)  ..