[Wireless Intercom Doorbell] - 1 outdoor doorbell can be paired with 1 indoor doorbell, the perfect combination allows you to communicate with visitors at your door. [Two-way Intercom] - When someone presses the call button on the outdoor unit, the indoor buzzer will ring immediately to remind you. You can press the answer button to talk to someone outside. [Clear Voice] - Built-in high-sensitivity microphone and speaker, 2.4GHz signal provides clear and smooth sound effects when communicating. Effective transmission distance up to 300 meters 【Easy to Use】 - Super mini size ensures perfect portability and easy installation, small and beautiful, easy to install. Suitable for home, factory, hotel, hospital, supermarket and office. 【Risk Free! Product transmission distance: 200 meters in open space; 5-50 meters if there are obstacles. Feature 1. The frequency of use of this product complies with national regulations and does not cause harmful electromagnetic interference. It can be used