Feature 1 DOORBELL UNIT: The pack contains 2 doorbell system units that can switch between ringtone call and intercom mode. 2 INTERCOM FUNCTION: The two units support two-way communication, allowing clear conversation without shouting. 3 LONG RANGE: The voice intercom device has a transmission distance of up to 1000 meters in open areas and 20 to 50 meters through walls, offering reliable performance. 4 INDICATOR LIGHT: The intercom units are designed with indicator lights for intercom and power status, making operation easy to monitor. 5 LONG BATTERY LIFE: The two-way voice intercom features a built-in large-capacity battery and an intelligent power-saving chip for extended usage. Item Type: Two-Way Voice Intercom Material: ABS Model: H8 Battery: Rechargeable Lithium Battery 3.7V 2000mAh (Built-in) Use: Suitable for household, office, laboratory, medical, and similar environments Basic Parameters: Working Temperature: -20°C to 55°C Transmission Distance: 1000m in open area, 20 to 50m through walls Operating Frequency: 410MHz to 490MHz Package List: 2 x Two-Way Voice Intercom Units 2 x Base Stations 2 x USB Cables 1 x User Manual