Get what one pays for.You couldn't find a such quality with the price level. Please don't worry,we provide one Year warranty and 30 days no reason return. Just Try It. How will the Wireless Digital Voice Intercom Doorbell work for you? More secure:With strong communication confidentiality and 2.4GHz ISM digital frequency hopping and encryption, technology robust anti-interference. Functional utility:Wireless remote unlocking, power saving and far distance communication, transmission distance up to 300m in free field. Outdoor unit:With touch button, more smooth. Rainproof, anti-oxidation and wear resistance outdoor unit, with rain-proof cover. Indoor unit: With ringing reminder and flash reminder, which is convenient for the deaf mute person to use; The indoor machine is provided with an unlocking key; When the conversation is started, the electric control lock is opened by wireless communication. NOTE:Both Indoor and outdoor unit use the high capacity lithium-ion rechargeable battery (model: BL-5J). Outdoor camera can be powered by adapters or lithium battery; The standby time is 90 days for battery. Specifications: Battery work voltage:3.4v~4.1v Battery charge voltage:5v Battery charge current:200ma(TBD) Indoor unit standby current:approx. 2ma outdoor unit standby current:approx. 10ua work temperature：-10~70 degree Sensitivity：-90db Distance in open area：300m Audio Rate：16K Audio Digits：16 digits Total harmonic distortion：-60db S/N Ratio:90db Frequency response:500hz~10khz Indoor Size:150*95*55mm Outdoor Size:170*50*30mm Package Includes: 1 x Indoor unit 1 x Outdoor unit 2 x Battery (BL-5G) 2 x Charger 1 X Screws 1 x User manual
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