Detailed Product Description Features: 1) 2.4GHz, 1/4" CMOS camera, 2.5" LCD screen, 380TV lines sharp picture display 2) 4 channels available to avoid possible interference 3) Built-in microphone and speaker in receiver for audio monitoring 4) Rechargeable Li-battery in receiver which can work 2 hours continuously 5) Bright and color adjustment for receiver 6) Moving detection alarm mode: receiver can make sound to alarm you when something is moving before camera 7) Open transmission distance: 100 meters 8) Frequency points for 4 channels: 2,414, 2,432, 2,450, 2,468MHz 9) Can design frequency points for customers especially in range between 2,400 and 2,483MHz 10) 4 cameras for multi-monitoring 11) Compact and diaphanous, convenient to take and use 12) Suitable for family and office security, especially for baby security 13) Also can be used for supermarkets, marketplaces, small residences, door surveillance and bird watching 14) Caution: illegal use is strictly forbidden