Features: [Real-time Video & Remote Control] Available to watch the real-time image even when you are out, download the APP Ulooka and the mobile receive they notify when someone rings the doorbell. [Hidden your Real Voice] Provide 2 different voice sound - male voice and funny sound, one button to switch and hide your real voice, safe for single people who live alone. [Clear Night Vision] Equipped with LED infrared light. Intelligently switch to infrared night vision mode. The image is clearly visible, you can see clearly without light. [Equipped with Doorbell Chime] Strong and stable signal, easy to pair up, the transmission range between the doorbell and chime is up to 10 meters; with USB power supply, easy to install, no worry of low battery. [Power Supply] The doorbell is powered by built-in 1000mAh large battery, has long working time after fully charged through power bank, AC adapter, computer, and more, no need to charge frequently. Specification: Size: 4.17 x 0.94 x 1.77in Receiver Size: 2.36 x 0.78 x 1.49in Resolution: 1280x720 Doorbell Visual Recording Range: 5m Audio Decoding: g.711/s System: Android 4.3 or iOS9.0 or later Battery: 1000mah Storage: Support 32G Package Size: 13x8x5.5cm/5x3.1x2.1in Package Weight: 179g/6.3oz Packing List: 1 x Doorbell 1 x Chime 1 x Doorbell Backplate 1 x User Manual