Wireless digital voice intercom doorbell, works in 2.4G ISM. Transmission power is less than 100MW, AFH adaptive FM technology, with strong communication confidentially, clear voice, wireless remote unlocking, power saving and far distance communication. The product is suitable for offices, villas, courtyard and unit family places. Features: 2.4GHz ISM digital frequency hopping and encryption technology, transmission distance up to 30-100m in free field, robust anti-interference. Outdoor unit with touch button, power saving, nice design, voice clear and loud. Rainproof, anti-oxidation and wear resistance outdoor unit, with rain-proof cover. Indoor unit is with handhold, couple with exquisite base, beautiful and practical. Indoor unit with ring reminder and flash reminder. Indoor unit with unlocking button, supporting wireless remote unlock. Both indoor and outdoor unit use the high capacity lithium-ion rechargeable battery, can be charged through mini chargers, long standby time. Microprocessing technology, automatic remote control, excellent performance, high reliability. 3.5 inch TFT color display, 0.3 megapixel camera, clear night image. Two-way intercom and remote control unlock function. Time displayed on an indoor monitor. The display can automatically take/save/view more than 100 photos. The monitor can be hung on the wall, on the cabinet, or on the table. Built-in 16 chord melodies. Specifications: Plug: US/UK/AU 100-240V Battery Work Voltage: 3.4V~4.1V Battery Charge Voltage: 5V Battery Charge Current: 200ma(TBD) Indoor Unit Standby Current: approx. 2ma Indoor Unit Work Current: 90ma(TBD) outdoor Unit Standby Current: approx. 10ua outdoor Unit Work Current: 110ma(TBD) work Temperature: -10~70 ℃ work Frequency: 2400MHZ---2483MHZ Transmission Power: 18dbm(TBD) Sensitivity: -90db Distance in Open Area: 300m Audio Rate: 16K Audio Digits: 16 digits Time Delay: approx. 16ms Total Harmonic Distortion: -60db S/N Ratio: 90db Frequency Response: 500hz~10khz Indoor Size: 17.5*5.5*3.3cm/6.9*2.2*1.3in Outdoor Size: 15.5*9.5*5.5cm/6.1*3.7*2.2in Charger Base: 10.5*9.5*13.1cm/4.1*3.7*5.2in Package Weight: 800g/28.2oz Package List: 1 * Indoor Unit (Battery Included) 1 * Outdoor Unit 2 * Charger 2 * Power Line 1 * Connecting Line 1 * Screws Installation Kit 1 * User Manual Notes: 1. The machine should be placed on the place with solid, well-ventilated, dry and no direct sunlight, no strong magnetic fields and dust. 2. Do not use chemical to clean the surface; clean, soft and dry cloth can be used to clean. 3. Advoid to press multiple keys at the same time. 4. Outdoor and indoor unit needs to match with specified modles, and can not mix to use with other modles or other company'sproduct. 5. Do not open the machinewithout permission, please contact with your dealer or our technical department if you need any maintence. 6. Please allow 1-3cm error due to manual measurement. Thank you for your understanding. 1、2.4GHz ISM digital frequency hopping and encryption technology, transmission distance up to 30-100m in free field, robust anti-interference. 2、Outdoor unit with touch button, power saving, nice design, voice clear and loud. 3、Rainproof, anti-oxidation and wear resistance outdoor unit, with rain-proof cover. 4、3.5 inch TFT color display, 0.3 megapixel camera, clear night image. 5、Two-way intercom and remote control unlock function.