Enhance security and communication with the NNEOBA 2-Way Wireless Doorbell System. Specifications:Wireless Frequency: 467.637 MHzDistance: 200 metersIndoor Machine Voltage Range: USB Power SupplyPower Supply: 4 x AAA Batteries (Not Included)Working Time: 4 monthsWorking Temperature: -20°C ~ 50°CSize (Indoor/Outdoor Unit): 10 x 6 x 1.6 cmPack Size: 17 x 12 x 2 cmPack Weight: 10g Benefits: Clear 2-way communication for security and convenience.Wide effective range of 200 meters, perfect for large homes or offices.Compact and portable design, easy to install and move.Adjustable volume and clear sound for a reliable intercom experience.Low power consumption with a long working time of 4 months. Description:The NNEOBA 2-Way Voice Intercom Wireless Doorbell System offers seamless communication between indoor and outdoor units. Whether you're at home, in a factory, or a hotel, this intercom ensures clear and immediate interaction through a built-in microphone and speaker. The compact, portable design makes it easy to install and use, while the stable 2.4GHz signal provides reliable performance up to 200 meters. Stay connected effortlessly with adjustable volume and superior sound quality for both input and output.