Feature: 1. Real Time Two Way Voice: This wireless intercom doorbell offers real time two way voice, providing a secure and private conversation with anti interference features. It's great for both home and office use, ensuring you never miss a visitor or important delivery. 2. One Button Operating: With a simple one button design, this doorbell makes it easy to call, answer, and end conversations. After 1 minute of conversation, the call will automatically end, making it convenient and efficient for quick interactions. 3. Loud and Clear Alerts: The doorbell features a flashing light and ringtone alert that lasts for 20 seconds, ensuring you're aware of any visitors. With a ringtone volume of 108 decibels, it's louder than a typical smartphone ringtone, so you won't miss any calls. 4. Long Lasting and Convenient Power: The outdoor unit has a battery life of 6 months. The indoor unit plugs into a 5V1A power adapter, ensuring it never runs out of power. The installation is easy, with the outdoor unit simply sticking to the wall with adhesive. 5. Premium Design and Long Range: The buttons are made of a plastic and silicone structure, with a high gloss finish for a high end look and feel. The intercom has a tested range of 100 meters, making it suitable for buildings with up to 4 floors. Plus, the indoor units can call and communicate with each other, adding an extra layer of convenience. Specification: Specifications: Method: Full duplex intercom Power Supply Method: A rechargeable li battery for the outdoor unit, and a 5V1A power adapter for the indoor unit Working Temperature: -20 ° C to 55 ° C Transmission Distance: About 100 meters in open space, 5-20 meters in partition walls, floors 1-4 Working Frequency: 433MHz Working Hours: The outdoor unit is recharged once, and the working time is about 6 months External Battery Capacity: 1000mAh Charging Time: Approximately 3 hours when the external unit is fully charged Music Ringtones: 5 ringtones Product Size: 68 * 70 * 27mm/2.7 * 2.8 * 1.1inch. Package List: 1 * Outdoor Machine 1 * Indoor Machine 1 * Instructions 1 * Screwdriver 1 * USB Data Cable Note: The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your light brightness. Please allow slight manual measurement deviation for the data.