PRODUCT FEATURES 2.4GHz, 1/4? CMOS Camera,2.5? LCD screen, 380TV lines sharp picture display 4 channels available to avoid possible interference Camera built in microphone and speaker in receiver for audio monitoring Rechargeable Li-battery in receiver which can work 2 hours continuously Bright and color adjustment for receiver Moving detection alarm mode（Receiver can make a sound to alarm you when something are moving before camera） Open Transmission distance100 meters. Camera with infrared for day & night vision, weatherproof Frequency points for the 4 channel is 2414Mhz, 2432Mhz, 2450Mhz, 2468Mhz,But can design for customer especially in range of 2400 MHz to 2483 MHz. SOLUTIONSThe product is cabinet and diaphanous. It is convenient to take and use.It fit for the family and office security,especially for baby security to avoid all possible dangery. It also could be used in the supermarket,marketplace,small residence, door surveillance, bird watching and so on.Caution: This product must be forbidden for illegal use.