The customer comes first! If you have any dissatisfaction with the product, we support full refund within 30 days! The Doorbell Sensor Can Record The Ding-dong Voice Reminder At The Supermarket Entrance And The Store Welcome Doorbell Alarm Features: One click recording is easy. No more changing banners on your computer, built-in memory for recording multiple voices. Infrared sensor for day and night. Welcome guests during the day and keep out thieves at night. 15 built-in voices can be switched at will, and the 4- volume adjustment is even more considerate. This product is mainly used in supermarkets, restaurants, clothing shops, convenience stores, pharmacies, flower shops and so on. It is easy to install and use and is fully functional. The buttons have icons on them for quick differentiation. Product Description: Power supply voltage: 5 (V) Power consumption: 0.5 (W) Sensing range: 90° up and down, 120% left and right Sensing distance: 0~4 meters Sound pressure: 75db~95db±5db Package List： 1*Doorbell 1*sticker 1*Instruction Manual Viflosae The Doorbell Sensor Can Record The Ding-dong Voice Reminder At The Supermarket Entrance And The Store Welcome Doorbell Alarm Electronics Gadgets Deals of the Day Clearance One click recording is easy. No more changing banners on your computer, built-in memory for recording multiple voices. Infrared sensor for day and night. Welcome guests during the day and keep out thieves at night. 15 built-in voices can be switched at will, and the 4- volume adjustment is even more considerate. This product is mainly used in supermarkets, restaurants, clothing shops, convenience stores, pharmacies, flower shops and so on. It is easy to install and use and is fully functional.