This wireless video doorbell works perfectly with 2.4ghz wifi, the wireless design frees you from cable troubles, and you can install it anywhere you like.features when visitor press doorbell, notification will sent to your cellphone, you can answer it and enter video call interface, supports maximum share to 10 family members. Auto capture at the same time and save image in cloud, you can review visiting records in app. Voice change function with a man voice at home, children and women get safer when alone. Easy installation paster or screw fixed, 3m sticker paste or physically screw fixed two way installation. High definition night vision, infrared night vision function, auto switch daynight. 38 melodies for your options, built-in melodies, adjustable volume. Built-in battery, charging time is about 1.5 hours, working time is about 6 months. Specifications material abs color white battery capacity 800mah charging time about 1.5 hours working time about 6 months product size doorbell size 7.5x4.8x1.6cm dingdong machine size 5x3.8x2cm package contents 1 x doorbell machine 1 x indoor ding-dong machine 1 x charging cable 1 x auxiliary installation stickers 4x screws 1 x manual