[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 even penetrate walls and floors, allowing for clear communication from the 1st to the 8th floor. This makes it an ideal solution for elderly care, home or office communication. [Slim and Sleek Design]: With a thickness of only 18mm, our intercom system is slimmer than similar products on the market which are usually over 22mm thick. The slim design, combined with a high-gloss UV-treated and a plastic + silicone button structure, offers a superior tactile experience. [Intelligent and User-Friendly]: Our intercom system is designed with user-friendly features, including a talk light and battery light display for easy monitoring. It also comes with a charging dock for smart charging, ensuring the device is always powered and ready for use. [High-Capacity Battery]: Powered by a 1800mAh polymer lithium battery, our intercom system can last for about a week with normal use (5 calls per day, per call). It also features a standby time of 3-5 days, making it a reliable communication tool for your home or office. [Versatile and Adjustable]: Our intercom system offers two frequency options (462MHz and 434MHz) to avoid interference. It also features 38 ringtone options and 3 adjustable volume levels for both ringtones and call volume. Please note that the two devices must be used together and cannot be used separately. Power Supply Method: polymer lithium battery 1800mAh Battery Powered: DC5V\/1A Working Temperature: -20 \u00B0 C to 55 \u00B0 C mission Distance: Approximately 1000 meters of open space, 20-100 meters of partition walls, floors 1-8 Working Frequency: B-gear frequency 462MHz A-gear frequency 434MHz Working Time: Charge once for about 1 week Charging Time: Approximately 5 hours when fully Standby Time: 3-5 days Sound Adjustment: 3rd