Feature VOLUME ADJUSTMENT: The doorbell has three levels of weak/medium/strong volume adjustables, high volume; a variety of pleasant ringtones can be switched at will. EASY INSTALLATION: The doorbell can be installed in any position through magnetic installation, non-hole installation, and adhesive backing to meet your different needs. Applications: It is suitable for home, business shops, stores, hotels, factories, doorway entrance place requiring either guests saluting function. Multiple Ringtone Options: Offers a variety of ringtone choices or voice messages, allowing you to personalize the sound alert to suit your preferences. Energy Efficient: Designed to be power-efficient, with low energy consumption, extending battery life or reducing energy costs for long-term use. Notice: Actual color may be slightly different from the image due to different light effect Please allow 1-3cm deviation due to manual measurement Description: Specification: Battery Type/Rechargeable Type Battery Type power supply: 3*AA batteries (self-provided) Rechargeable Type battery capacity: 400 mAh Audios output power: 0.8-1W Audios format: MP3 Infrared sensing range: Rechargeable Type: equipped with lithiums battery, USB cable Package List: 1x Inductive DoorBell Voice Reminder