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. 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 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