Welcome to my store、Features:Easy to Install、 no wiring requiredRemote control range up to 100m in open air、 suitable for home、 offices、 hotels、 etc.Build in anti-interference desgin、 avoid the interference between usersSpecification:Input Voltage: DC 3VChime: power by 2 x 1.5V AA battery(battery not incluced)Bell push uses 1x 12V 23A Alkaline battery (not included)Music Sound: 32 melody musicSize of Remote Control is about 72 x 38mmSize of door bell is about 95 x 60 mmPackage Content:1x Remote control wireless door bell1x Remote ControlLooking forward to your looking again