Feature 1WIRE 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. 21 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. 3STABLE 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. 4CALLER ID DISPLAY: The digital screen displays the caller's number, allowing you to easily identify incoming calls and track communication history. 5WIDE 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.Item Type: Wireless IntercomMaterial: ABS Operating Frequency: 433MHzWorking Distance: 1000m/3280.8ft (without any obstacles)Power: 2WVoltage: 5V 2ANetwork Group: A maximum of 999 .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Host1 x Extension2 x Instruction Manual2 x Data Cable