1Wide Application: Wireless intercom doorbells is widely used in homes, hotels, villas, factories, hospitals, etc. 2Practical: It includes one outdoor doorbell and two indoor doorbells. When you press the doorbell outside, the two internal doorbells ring. You can reply by voice when you press TALK. 3Strong Penetrating Power: Home doorbells adopts intelligent intercom chip, which has strong penetrating power. It can be used from the 1st floor to the 8th floor, and the barrier free distance is about 1000m. 4Intelligent Design: Voice intercom doorbells adopt intelligent and humanized design, with intercom light and power light display, and the operation is clear at a glance. 5Working Time: 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.