1、Wireless digital, encrypted transmission, safe and reliable, two‑way intercom, 5‑level volume adjustable. 2、The baby monitor has 2‑way calls, built‑in music and night light, which can be turned on/off in both directions. 3、Using FHSS, anti‑interference and sound clarity, the transmission distance can reach 200‑300 meters in the field. 4、The transmitter and receiver need to be paired code before any confidence operations can be performed. 5、When there is without any sound from transmitter within 20 second , the receiver will be in mute state. 6、The working frequency of the Baby alert monitoris is 905‑925MHz ISM band. 2 x Monitor2 x Power Plug1 x Manual  Iteam Type: Baby Sound MonitorWeight: Approx. 424g / 15ozMaterial: ABSModel: V30Use Environment: Indoor Power Supply Voltage: 5V Operating Frequency: 905-925MHzTransmission Power: 10 dBModulation Method: FSKSpread Spectrum Method: FHHSAudio Coding: ADPCMModulation Frequency: 180 kHzEncoding Rate: 500 kilobitsReceiver Sensitivity: S-92 decibelsPower Supply Mode: Power supply or 3 x AAA dry battery (Battery Not Included)Working Temperature: 0℃-50℃Open Space Transmission Range: Approx. 300m / 984.3ft