Feature: 1. Wireless digital encryption transmission, safe and reliable. Adopt frequency hopping spread spectrum(FHSS), anti‑interference and sound clarity. 2. Two‑way intercom, 10 levels of adjustable volume. With 2‑way talk, music and night light function 3. Long distance transmission 200‑300 meters in the open field, you can connect with your baby from another room or even from the yard. 4. With 2‑way talk function, you can hear your baby voice and comfort them instantly with your voice button when they crying. 5. When there is without any sound from transmitter within 20 seconds,the receiver will be in mute state. Specification: Item Type: Digital Audio Baby Monitor Material: ABS/electronic components Wireless Baby Audio Monitor (Child) Battery Model: 3 x AAA battery (not included) Wireless Baby Audio Monitor (Mother) Battery Model: 3 x AAA battery(not included) Single Size: Approx.8.8 x 7.2 x 3.3 cm / 3.5 x 2.8 x 1.3in. Package List: 2 x Baby Audio Monitor2 x Plug1 x User Manual