【Two-Way Voice Communication】Experience clear, bidirectional voice communication with this wireless intercom doorbell, enhancing convenience and security 【Long-Range Transmission】Enjoy a transmission range of up to 300 meters in open areas, ensuring reliable communication even at a distance 【Adjustable Volume】Choose from 5 volume levels ranging from 0 to 110dB to suit your preferences and environment 【Multiple Ringtones】Select from 23 different ringtones to personalize your doorbell sound 【Weather-Resistant Design】With an IP45 waterproof rating, this doorbell is designed to withstand rain and harsh weather conditions Specifications: Power supply: Internal unit: 2000mAh rechargeable battery (included), external unit: 3 x AA batteries (not included) Product size: Internal unit: 13.8*7.5*4.4cm, external unit: 12.8*6*3.1cm Volume: 0-110dB, 5 levels of volume Number of ringtones: 23 Transmission distance: 300 meters in open areas Working temperature: -40 to 85℃ Waterproof level: IP45 rainproof design Remote control distance: about 300 meters (open areas) Product material: ABS