BATTERY SELF -POWER GENERATION FUNCTION: Doorbell Button uses self -power generation technology. It is no longer worried about battery problems. It is not troublesome to replace the battery and will not cause pollution to the environment. REMOTE CONTROL: Smart Doorbells can perform remote control. As long as your smartphone has a network connection, you can control the doorbell anytime, anywhere. RECORDS CAN BE CHECKED: Wireless Doorbell has a record function, and information push function. You can view the doorbell records by the day, support the mobile phone ringing information, the app display the name button, which is convenient to understandthe visitor. SMALL AND LIGHT: Elderly Pager can be carried with you and easy to use. When the elderly and children at home press the alarm button, they can immediately receive the alarm signal. RINGTONE SETTINGS: Self-generated Doorbell can set different ringing tones to distinguish between the front door and the back door. Each button's bell can be adjusted individually, and the 0-100% volume adjustment buttons support individual renaming.