[Long-Range Communication]: Our wireless two-way intercom system is designed for long-range communication, with a tested range of up to 300 meters. It can penetrate walls and floors, allowing for clear communication across multiple levels. This makes it suitable for home or office use. [Slim and Sleek Design]: With a thickness of only 18mm, our intercom system is slimmer than many similar products on the market. The slim design, combined with a high-gloss UV-treated surface and a plastic + silicone button structure, offers a comfortable tactile experience. [Intelligent and User-Friendly]: Our intercom system includes user-friendly features such as a talk indicator light and battery status indicator. It also comes with a charging dock for convenient charging. [High-Capacity Battery]: Powered by an 1800mAh polymer lithium battery, our intercom system provides extended operation time with typical usage. It supports standby time of several days. [Versatile and Adjustable]: Our intercom system offers two operating frequencies (462MHz and 434MHz) to help reduce interference. It includes multiple ringtone options and adjustable volume levels for both ringtones and call audio. Note that the two units are designed to operate together as a pair. Power Supply Method: 1800mAh polymer lithium battery Charging Input: DC5V/1A Operating Temperature: -20°C to 55°C Transmission Distance: Up to 1000 meters in open space; 20–100 meters through walls or floors Operating Frequency: 462MHz and 434MHz Battery Life: Approximately one week with typical usage