2.4G transmission frequency, barrier-free communication distance is about 100 meters. Adopting micro-processing technology, fully automatic wireless control function, well performance. Clear night vision function, can realize 24 hours of monitoring, call, intercom, unlock and other wireless functions. The indoor unit automatically takes pictures through the outdoor unit, and the indoor unit can also take pictures actively and store them automatically. The indoor unit has functions of clock, photo,record video, ringtone, and setting menu and clock adjustment, photo storage.support 32G TF card., Manufacturer: QAXRZCUCD