Brand New Features: WiFi video doorbell connects to network via wireless router or network cable. Mobile devices include smartphone or tablet, could connect to the doorbell. After the visitor rings, mobile devices could interact with doorbell via real time video and audio, user can view the visitor, then decide to whether intercom or open the door etc. Make Video phone call with visitors, and short time recording, known visitor information without door open. Specifications: OS Embedded Linux OS System security Three-level user authority management Online visitor Support up to 4 online visitors simultaneously DDNS Built in free DDNS Processor Hi processor, built in ARM926 @Max. 440MHz and high-speed video co-processor. Image sensor 4-inch 720p progressive scan CMOS sensor Sensor support AWB,AGC,AE Sensor size 3.84mmx2.16mm SNR >39dB Lens/viewing angle 1.7mm@F2>/96.96s Night vision Dual IR-CUT Fitter auto switch, 1pcs 850nm28mil super power LED,5m IR distance. IR-Control IR turned on: night vision view enabled, infrared Ray, ICR auto detect. IR turned off: night vision disabled, infrared ray off, ICR stay in day view mode. Compression standard H.264 Main Profile/H.264 Baseline Profile/MJPEG/JPEG Baseline Resolution 720p/VGA/QVGA Frame rate 30fps/25fps (720p) Image adjustment Brightness,Contrast, Saturation are adjustable. Input 1 Channel Internal -48dB microphone Output Internal speaker(801W) Sampling frequency/ bits wide 8KHz/16bit Compression standard / bit rate ADPCM/32kbps WiFi 802.11b/g/n Network security WPS encryption Wireless Connection AP hotspot Rated Voltage DC5V/2A Power supply Mciro USB interface ,power supply 5V / 2A Power consumption Rated power： 3.2w(IR on ) Package includes: 1 x Doorbell 1 x Power adapter 1 x Charge Cable 1 x Connect Cable 1 x Bag of Mount screws Box may show wear and tear.