2.4GHz launch frequency , barrier-free remote control distance is between 180-400m With micro-processing technology, auto-remote control , excellent performance and high reliability The TFT3.5" digital color LCD for monitor CMOS 300,000 pixel for camera Clear night-viewing£»24 hours monitoring , calling , speaking and unlocking remote controlling etc One cameras can support 6 pcs monitors at most further information, please contact the salesman The mini USB data output for monitor built-in high capacity rechargeable Lithium battery The monitor can take/save/view more than 200 pcs of photos automatically. 26*25*10,1KG per set.