This 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 between levels. The device has a slim design with a high-gloss surface. Features include a talk light and battery light display for monitoring, and it comes with a charging dock. It is powered by a 1800mAh polymer lithium battery. The system offers two frequency options to avoid interference, along with multiple ringtone options and adjustable volume levels. The two devices must be used as a pair. Power Supply Method: polymer lithium battery 1800mAh Battery Powered: DC5V/1A Working Temperature: -20°C to 55°C Transmission Distance: Approximately 1000 meters in open space, 20-100 meters through partition walls, floors 1-8 Working Frequency: B-gear frequency 462MHz, A-gear frequency 434MHz Working Time: Approximately one week per charge Charging Time: Approximately 5 hours for a full charge Standby Time: 3-5 days Sound Adjustment: Adjustable volume levels