Wireless Intercom Doorbell- 1 outdoor doorbell can be paired with 1 indoor doorbell, the perfect combination allows you to communicate with visitors outside your door.<br> Two-way Intercom- When someone presses the call button on the outdoor unit, the indoor bell will ring immediately to remind you. You can press the response button to talk to someone outside.<br> Clear Voice- Built-in high-sensitivity microphone and speaker, 2.4GHz signal ensures clear and smooth sound effects in communication. Effective transmission distance up to 300 meters<br> 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. caution<br> Product transmission distance: 200 meters in open space; 5-50 meters when there are obstacles<br> feature<br> 1. The frequency of use of this product complies with national regulations and will not cause harmful electromagnetic interference. It is universally applicable.<br> This device complies with FCC, CE, CCC related rules and regulations.<br> 2. The outdoor unit is easy to install and remove the batteries, using 4 AA batteries, and the indoor unit uses rechargeable lithium batteries.<br> The outdoor bell is powered by 4 alkaline batteries for easy battery replacement, and the indoor bell is powered by a rechargeable lithium-ion battery.<br> 3. The outdoor unit has a long working time, and 4 batteries can be used for more than half a year.<br> Low power consumption, outdoor bell standby time of up to six months<br> 4. The loudspeaker sound is loud, the volume can be adjusted, the ringtone can be changed, and the intercom sound quality is clear, which can be used for mobile intercom.<br> The loudspeaker can be adjusted, the sound is clear, and it can be used as a mobile phone walkie-talkie.<br> 5. Long working distance, the maximum open distance is 200 meters.<br> Ultra-long wireless distance of up to 200M<br> 6. Easy to install, directly stick to the wall with 3M glue.<br> Easy wall mount with 3M tape<br> 7. Learning code to code, one outdoor unit supports N indoor units without interfering with each other and without changing codes.<br> The outdoor bell can be paired with the indoor bell by learning its password. One outdoor bell can be paired with N indoor bells without interfering with each other.<br> 8. Exquisite and compact, beautiful and high-end. Size: 100*60*14.8mm