Waterproof Wireless Door Bells & Chimes Alert System Easy to build your own alert system with this wireless doorbell kit, the doorbell receiver can be paired with up to 32 wireless doorbell buttons/ magnetic sensors/ infrared sensors. Up to 1300ft (400m) wireless range -Waterproof and Durable -Up to 1300ft (400m) wireless range in open area. 2. 131~262ft (40m~80m) wireless range indoor with obstacles. -Eye-friendly LED Night Light -48 Premium Chimes -DIY Your Alert System Easy Installation 1. Easy installation with the included double sided adhesive tape. 2. Permanent installation with the anchor designed on the back of the doorbell button. Package includes: 2 x Doorbell Button (Transmitter) 1 x Plug-in Doorbell Receiver 2 x Double Sided Adhesive Tape 1 x Screw 1 x User Manual.