Features The product does not contain batteries！！！ ●Low-power WIFI video doorbell ●720P, 166° wide-angle lens ●Support PIR motion detection, message push mobile phone ●Support Wi-Fi 2.4 GHz, IEEE 802.11b/g/n ● Support button wake-up, PIR detection wake-up, mobile phone active wake-up ●Two-way intercom, comes back? 9? 1 tone elimination ●Support 8-32G micro sd card ●Low power consumption 2 * 18650 lithium battery ● 2 18650 batteries (15 wakes up every day, 15 seconds each time, can be used for 6~8 months)