Features 1. High definition clear video with 65 viewing angle, display the details in front of your door,reliable and practical. 2. Wifi connection, no wire needs, achieve a two way intercoms between the doorbell and mobile phone. Real-time mobile phone, support two-way calls, photos, recording, caring for your family makes you more secure. 3. Disassembly free cycle charging, built-in 800 mAH lithium ion high-capacity battery, more than 6 months of normal use. Charging time 1.5 hours. 4. Equipped infrared night visions, automatically open at night. When you are alone at home, you can use the voice change intercom function to easily deal with strange visitors 5. The doorbell can be controlled by APP, automatical work model, intelligent and portable.Portable in size and weight, convenient to install and remove. Specification Material: ABS Color: White Size: Doorbell machine: 8 x 5.3 x 2.2 cm/3.15 x 2.08 x 0.86 inch, Ding dong machine: 5.5 x 4.2 x 2.5 cm/ 2.16 x 1.65 x 0.98 inch (Including USB: 1.2 cm/0.47 inch height) Weight: Bell machine: 65.7 g, Ding dong machine: 23.3 g Power: 5 V Battery capacity: 800 mAH Charging time: 1.5 hours Usage time: More than 6 months of normal use Package Include: 1 x Smart Video Doorbell 1 x Internal ding-dong Machine 1 x Charging Cable 1 x Adhesive installation aid 1 x Instruction