Product Description 1000-meter Long-Range Clear Voice Intercom: This wireless home intercom system boasts a transmission distance of up to 1000 meters in open environments, ensuring you don't miss any visitors even if you're several rooms away! It provides real-time, clear two-way voice communication, allowing you to talk directly to visitors without getting up to open the door. Real-time Two-way Communication: When someone presses the call button on the outdoor unit, the indoor doorbell will immediately ring to alert you. You can press the answer button to talk to the person outside. Convenient connectivity and portable design allow for quick, easy, and efficient communication in homes, offices, classrooms, hotels, villas, factories, hospitals, and other locations. IP54 Waterproof with Built-in Rechargeable Battery: This wireless doorbell is waterproof even in harsh weather conditions such as heavy rain and snow. Both the outdoor and indoor units use 2000mAh batteries. With the outdoor doorbell functioning normally, pressing the call button 5 times a day for 2 minutes each time provides approximately 6 months of battery life; the indoor doorbell lasts approximately 1 week. This wireless doorbell boasts an IP54 waterproof rating and a built-in rechargeable battery, maintaining its waterproof capability even in harsh weather conditions such as blizzards and heavy rain. Both the outdoor and indoor units use 2000mAh batteries. With the outdoor doorbell functioning normally, pressing it 5 times a day for 2 minutes each time will provide approximately 6 months of battery life; the indoor doorbell will last approximately 1 week.