【Real-Time Two-Way Communication】Experience phone-like communication with this wireless intercom doorbell, allowing for hands-free conversations once connected 【Long-Range Connectivity】Enjoy clear communication up to 400 meters in open areas, 300 meters indoors, and through 3 walls, ensuring reliable coverage throughout your home 【Compact and Stylish Design】The doorbell features a cute, compact design with a matte ABS finish for a pleasant tactile experience 【User-Friendly Interface】Adorned with a charming smiley face button and equipped with indicator lights for intuitive operation 【Versatile Audio Options】Choose from 4 melodious ringtones with 8 adjustable volume levels to suit your preferences Specifications: Outdoor Unit Power: 1.5V AAA batteries (not included) Indoor Unit Power: DC 5V/1A Operating Temperature: -20 to 60℃ Ringtones: 4 melodies with 8 volume levels Outdoor Unit Dimensions: 8 x 5.2 x 2.3cm Indoor Unit Dimensions: 8 x 5.2 x 1.3cm