Feature: 1. Two Way Voice Intercom Technology: Experience seamless communication with our Wireless Doorbell Intercom, which allows you to enjoy real-time conversations similar to a phone call. This Intercom Doorbells system ensures easy and efficient interaction without the need for manual operation. 2. Excellent Range and Mobility: With a remarkable communication distance of up to 400 meters outdoors and 300 meters indoors, our Wireless Doorbell Chime Intercom System can penetrate through three walls, providing you the flexibility to communicate effortlessly from different locations. 3. Sturdy and User-Friendly Design: Crafted from high-quality ABS material with a textured finish, this Electronic Doorbell Chime features a rainproof cover for outdoor durability. The ergonomic design includes silicone and plastic buttons with a glossy UV finish for superior tactile feedback compared to traditional all-rubber buttons. 4. Smart Power Management: The intercom is equipped with a low-power 1000mAh polymer lithium battery, allowing the outdoor unit to stand by for six months on a full charge. The indoor unit can last a week, ensuring you stay connected without frequent recharging. 5. Personalized Alerts and Sounds: Enjoy customizable features with four musical ringtones and eight volume levels. The intelligent design includes visual indicators and voice prompts for low battery notifications, ensuring that your Wireless Doorbell is always ready to use when you need it. Specification: Working Temperature: -20 ° C to 60 ° C Music Ringtones: 4 songs Volume: Adjustable in 8 levels Call Distance: 400 meters in open space, 300 meters indoors, can penetrate 3 walls Power Supply: DC 5V/1A Battery Capacity: 1000mAh Outdoor Unit Size: 5 * 1.8 * 10 cm/2 * 0.7 * 3.9 inch Outdoor Unit Weight: 69 g/2.4 oz Indoor Unit Size: 7 * 2.5 * 13 cm/2.8 * 1 * 5.1 inch Indoor Unit Weight: 92 g/3.2 oz Waterproof Cover Size: 5.5 * 3.2 * 10.5 cm/2.2 * 1.3 * 4.1 inch Charging Dock Size: 9.4 * 5.5 * 4 cm/3.7 * 2.2 * 1.6 inch Package List: 1 * Outdoor Unit1 * Indoor Unit1 * Rain Cover1 * Charging Dock2 * Green Rubber Plug3 * Screws1 * 6 Language Instructions Manual1 * Charging Cable1 * English Doorbell Label1 * Transparent Adhesive