First-ever monitor with Digital Green Technology: combining the performance of clear, zero interference digital technology with the safety of low-emission power levels Safer for baby. Mobile phones, Wi-fi, baby monitors....all devices that emit electromagnetic waves around baby. Babymoov's baby monitors emit less waves! Up to 33 times less waves. High Range: 2,650 ft. and long battery life; rechargable lithium battery(parent unit) and AC adapter or 3AAA batteries(baby unit). Batteries not included. VOX function : monitor activates when baby starts crying. Night light, voice activated or continuous Automatic channel search, acoustic alarm " out of range" and "low battery", Belt clip on receiver for hands free