Feature: 1. WIRE FREE COMMUNICATION: Enjoy full duplex wireless voice communication without the need for any wiring. With a range of up to 1000m/3280.8ft, you are not limited by room constraints. 2. 1 BUTTON CALLING: The 1 button calling feature allows for instant broadcasting without the need for waiting. You can customize call tones and volume settings according to your preferences. 3. STABLE TRANSMISSION: Operating at a frequency of 433MHz, the system ensures stable signal transmission and clear sound. It supports up to 100 devices without the need for code pairing. Additionally, it can be connected to a network to enhance office productivity. 4. CALLER ID DISPLAY: The digital screen displays the caller's number, allowing you to easily identify incoming calls and track communication history. 5. WIDE RANGE OF APPLICATIONS: Wireless intercom system is suitable for various settings such as companies, factories, hotels, offices, teahouses, KTVs, hospitals, and entertainment venues, providing reliable wireless intercom solutions. Specification: Item Type: Wireless Intercom Material: ABS Operating Frequency: 433MHz Working Distance: 1000m/3280.8ft (without any obstacles) Power: 2W Voltage: 5V 2A Network Group: A maximum of 999. Package List: 1 x Host 3 x Extension 4 x Instruction Manual 4 x Data Cable