【Check Before Purchasing】(Note: This doorbell is not battery powered). Comes with power kit, wire extenders, receiver, reset pin and tool kits. Only compatible with existing traditional mechanical and electronic digital chimes 【2.4G Wi-Fi & Easy Installation】Comes with user manual. Download"Woox Security "APP on Google Play/App Store, friendly App operation can help you use it quickly,then connect the power supply to try to connect the doorbell and then install it outside. ONLY support 2.4GHz WIFI (5GHz cannot be supported).It is safe to be used in all weather conditions. 【Secure Cloud Storage and Local Storage】Video doorbell adopt financial encryption, support 128G Micro SD storage(not included) and Cloud storage (Paid)for your optional, maximum protect your personal privacy secury and avoid your data breaches. You’ll never miss out a moment with remote and playback video with the encrypted Cloud service wherever you are 【Smart PIR Motion Detection】The built-in PIR motion sensor detects the slightest movement in front of your door. You’ll get a push notification on your phone if someone keeps too long. Check suspicious activity any time or anywhere you are