Feature: 1. 2.4GHz digital wireless transmission, with stable transmission signal and long‑distance transmission, up to 200‑300 meters of empty place. 2. Built‑in MIC and speaker, used for 2 way audio listening monitoring and the tone quality is clear. 3. Support 2 way voice, mother can directly hear when baby make sound, mother needs to press the button to speak. 4. The volume can be adjusted, mother can control the baby's music, night light and volume. 5. With a song in it, mother can press the button to play this song to help baby sleep faster. Specification: Condition: 100% Brand New Item Type: Audio Baby Monitor Material: ABS plasticTransmission Frequency: ISM 905-925mhz Transmission Power: 10dBm Modulation Type: FSK Modulation Frequency: 180KHz Reception Sensitivity: ≤-92dBm Power Supply: DC5V USB or 3pcs AAA batteries (Not Included) Operating Current of Transmitter: Maximum 180mA Transmitter Standby Current: Maximum 75mA Operating Temperature Range: 0-50℃ Storage Temperature: -40-70℃. Package List: 1 x Transmitter1 x Receiver1 x Description2 x Power Supply