Product Name: 32 Melody Visitor Doorbell Chime/Alarm with "Hello, Welcome" Model NO.: 371 Detect Distance: 1.2-2.0m Certification: CE, FCC, RoHS, CCC Detection Signal: Intelligence System Application: Video Store and Bookstore, Warehouse, Shopping Arcade, Supermarket, Garment Store, Jewelry Store, Hotel, Shop, Office System Design: Light Sensor Type: Sensor Voice: Dingdong and 32 Sound Trademark: Longriver Transport Package: Blister Card or Box Specification: 50PCS/CTN Origin: China HS Code: 8531100000 Product Description NEW *The "VISITOR CHIME" is alight sensitive, motion activated entry chime,suitable for office and retaillocations to announce the entrance of visitor.*Requires 3AA batteries or DC6V regulated adapter 300mA(not included).*32 selectable melodies and sounds *Ideal for protecting home, office or shop to announce the entrance of visitor.Please check its sensitivity monthly, to make sure it is in good condition. Change batteries every 3month if you do not use 220V charger.Hefei Long River Electrical Co.,Ltd.Tel:+86 13956994028 , www.anhuibell.com