Feature: 1. Dual Way Comm: This kit includes 2 door bell system units that can switch between ringtone calling and intercom mode. The working frequency is 410‑490MHz, with a wide range of applications. 2. Indicator Light: The wireless voice intercom system adopts a humanized design, equipped with intercom light and power light, ensuring that users are clear at a glance and respond quickly to information. 3. Long Distance: The transmissing distance of wireless voice intercom equipment can reach 1000 meters in open space and 20 to 50 meters through wall, with strong practicality and high reliability. 4. Easy Adjustment: The portable voice intercom system has 2 channels A and B, and 3 volume levels, which users can adjust according to their preferences to meet various different needs. 5. Wide Application: This dual way voice intercom system has clear sound quality and is suitable for different application scenarios, including homes, hospitals, hotels, laboratories, and factories, etc. Specification: Item Type: Wireless Home Intercom System Material: ABS Waterproof Rating: IP54 Indoor Unit Battery: Rechargeable Lithium Battery 3.7V 1800mAh (built in) Outdoor Unit Battery: Rechargeable Lithium Battery 3.7V 1800mAh (built in) Application: For Home, Office, Laboratory etc. Working Temperature: -20℃ to 55℃ Transmissing Distance: Open Space Approx. 1000 meter / 3280.8ft; Through Wall Approx. 20-50 meter / 65.6-164ft Working Frequency: 410MHz-490MHz. Package List: 1 x Indoor Unit 1 x Outdoor Unit 1 x Base 1 x USB Cable 1 x DC Power Cable 1 x Screwdriver 1 x User Manual