Overview:

K900 is a Wi-Fi-enabed smart doorbell that allows you to see who is at your door no matter where you are or what you're doing. The device has a video camera, 

microphone and speaker that lets you see, hear and speak to your visitor from iOS and Android mobile/tablet PC devices.

K900 provides a whole new level of control and convenience while answering your door. Motion sensor or PIR sensor will provide the ability to receive an alert even if 

the visitor doesn't press the button (Coming Soon). K900 replaces your current doorbell and it keeps you connected whether you're at home, at the office or on-the-go.

Packing:
1 x Doorbell unit   
1 x Micro-USB charging cable
1 x 5pin wire  
1 x App(electro-file)
1 x User manual
1 x mounting bracket(Shield)
1 x Lithium battery  
1 x Power adapter
1 x Tailor-made screwdriver
1 x Screws
1 x SD Card

Data parameter:
Size                                          114*95*44mm
Weight                                        300g
View angle                                    165°
Battery                                          3100mA
Installation type                             Pit mounted in the wall
System                                        iOS and Android
Charging way                                  Connects wire with device,link power directly to supply                       
                                              Use power adapter to charge battery

Main functions:
Wi-Fi Enabled 
     Connects to home's WiFi network. Compatible with B/G/N networks
PIR & Motion sensor
     Activates photo and video feed without pressing button
165° view angle
     Security wide angle lens to monitor
CMOS sensor
     0.3M pixel resolution for analog camera lens
Connects 433Mhz frequency
     Can learn any 433Mhz frequency electronics then make work, such as unlocking, detect smoking etc
Two-way audio and one-way video
     Host see and hear visitor, visitor hear and talk to host.
Multi-mobile devices to monitor
     After match same signal, then can control doorbell forwardly and   passively.

After sales service:

Warranty: 12 months
Guarantee:
    Quality issue for non-artificial:  
During in one month any issue can be changed new item
During in one year any issue can be fixed well freely
    Quality issue for artificial that need charge for some parts:
Such as in-correct installation way to make wire broken, the cell be scratched or be destroy.
To be sent back products which need fix, had better attach detailed description.
Send back company freight that be charged by your side.