1000M LONG RANGE & CLEAR VOICE INTERCOMThis wireless home intercom system transmits at a distance of up to 1000m in the open space, you will never miss any visitors, even if you are several rooms away! It provides you real time clear two way audio, so you can speak directly to the visitors who approaches your front door via this wireless doorbell without having to get up and answer the door. REAL TIME TWO WAY COMMUNICATIONWith this door ringer, when someone press the call button on outdoor unit, the indoor bell rings immediately for reminding you. You can press the response button to talk with the people outside. Effortlessly connect and portable design makes your communication quick, easy and effective for your home, office, classroom, hotels, villas, factories, hospitals, etc. IP54 WATERPROOF & BUILT IN RECHARGEABLE BATTERYThis wireless doorbell chimes is waterproof even in bad weather conditions like snow and rainstorms. The outdoor unit and the indoor unit both use 2000mAh batteries, and the outdoor doorbells work normally. It can work for about 6 months by pressing 5 times a day and talking for 2 minutes at a time, and the indoor doorbells work for about 1 week. IP54 WATERPROOF & BUILT IN RECHARGEABLE BATTERYThis wireless doorbell chimes is IP54 waterproof even in bad weather conditions like snow and rainstorms. The outdoor unit and the indoor unit both use 2000mAh batteries, and the outdoor doorbells work normally. It can work for about 6 months by pressing 5 times a day and talking for 2 minutes at a time, and the indoor doorbells work for about 1 week.