Feature:1. Easy To Use: Wireless long distance about 1000 meters, no network, no wiring, power on and use.2. Intelligent Intercom Chip: The use of special intelligent intercom chip, strong penetration, suitable for floors 1 to 8 floors, the villa home preferred.3. Material: The keys are made of plastic and silicone structure, the surface of the high gloss uv process, super feel.4. Humanized Design: Intelligent humanized design, with intercom light and power light display, the user can see at a glance.5. IP54 Waterproof: Wireless call outdoor doorbell with IP54 waterproof technology, can withstand harsh environments.Specification:Item Type: Voice Intercom DoorbellProduct Material: ABSBattery: 3 x Li Polymer 2000mAh (Included)Working Temperature: -20-55Wireless Distance: Approx.1000m or 1093.6yd (Without Obstacle), 20m-50m or 21.9-54.7yd (With Obstacle)Wireless Frequency: 410M-490MWorking Time: Outdoor Doorbell andgt 6 Months Indoor Doorbell About 1 WeekWaterproof Level: Outdoor Doorbell IP54Weight: Approx.447g or 15.8ozOutdoor Doorbell Size: Approx. 18 x 61.6 x 121mm or 0.7 x 2.4 x 4.8inIndoor Doorbell Size: Approx. 18 x 116 x 56 x 70mm or 0.7 x 4.6 x 2.2 x 2.8in.Package List:2 x Indoor Unit1 x Outdoor Unit3 x Power Cord 1 x Screwdriver2 x Base1 x User Manual