Description: 1.Physically simple and elegance. 2.Ringtone rhythm lamp and loudspeaker which are easthetically and acoustically pleasant,48 chimes for your choice. 3.Receiver designed with night light function,7 adjustable brightne for night light function (included OFF mode),feel extra comfortable when lite up gently at night time. 4.Batterie life span is 6 to 10 years an rarely for batteries replacement. 5.IP66 waterproof,low temperatrue resistance,suitable expose to outdoor rain and snow weather. 6.Advanced wirele technology,Up to 1300ft (400m) wirele range in open area. 131~262ft (40m~80m) wirele range indoor with obstacles,suitable for grand houses or heavy duty anti-theft doors. 7.Extra detailing function:power-off memory function,no need to configure doorbell settings (Chimes, Volume, Lightne) again if unplugged,privacy button,ultra-low power consumption,pairable wirele sensors. 8.Workable areas:private houses,villas,schools,companies,hospital and etc. 9. 5 volume levels from 85-97dB (included silent mode). 10.Support DIY pairing, add up to 32 additional wirele doorbell buttons/ magnetic sensors/ infrared sensors to your own alert system. Package Inclede: Package A: 1 x Bell 1 x Button Package B: 1 x Bell 1 x Button 1 x Magnetic Sensor Package C: 1 x Bell 1 x Button 1 x Waterproof Motion Sensor