<p><span style="background-color:rgb(252, 220, 0);font-size:20px;font-family:&quot;times new roman&quot;, times, serif">Attenption : the choice just one pcs doorbell , if you need intercom , at least buy two pcs </span></p><p><span style="background-color:rgb(252, 220, 0);font-size:20px;font-family:&quot;times new roman&quot;, times, serif"> and it can work with more than 2 pcs ,the signal booster is not included , if you need work </span></p><p><span style="background-color:rgb(252, 220, 0);font-size:20px;font-family:&quot;times new roman&quot;, times, serif">more than 1KM , need use the signal booster , need pay extra </span></p><p>Product selling points:</p><p><br/></p><p>1. Intelligent digital duplex communication</p><p><br/></p><p>2. The communication distance is 1000 meters, and with the addition of a signal amplifier, the communication distance can reach 2000 meters</p><p><br/></p><p>3. The antenna is a rotatable external antenna with stronger and more stable signals, highlighting key points, and is a patented product</p><p><br/></p><p>4. Can simultaneously network 999 hosts or extensions for communication</p><p><br/></p><p>5. One click extension to call the host, convenient and applicable</p><p><br/></p><p>6. Clear communication, intelligent without code jumping, strong anti-interference ability</p><p><br/></p><p>7. Intelligent networking mode, 3-step operation, simple and convenient.</p><p><br/></p><p>8. Two power supply methods: 1. Battery power supply, standby time of about 2 months. 2. Directly plug in the power supply, never power off</p><p><br/></p><p>9. The machine is exquisite, high-end, and can be flexibly used in various scenarios</p><p><br/></p><p>10. The body is made of plastic and aluminum alloy material, which is high-end, durable, and good-looking,</p><p><br/></p><p>11. In noisy scenes, headphones can be used in combination to answer and speak</p><p><br/></p><p>12. Can be connected to an external super large audio system</p><p><br/></p><p>13. One step installation on the wall, using 3M adhesive, no need for screws to fix</p><p><br/><br/><br/></p><p>Product parameters:</p><p><br/></p><p>Power supply method: lithium battery power supply</p><p><br/></p><p>Working temperature: -10 ° C to 55 ° C</p><p><br/></p><p>Transmission distance: about 1000 meters in open space, 40-100 meters in partition walls, floors 1-9</p><p><br/></p><p>Working power: 0.5W</p><p><br/></p><p>Operating frequency: 410MHz to 460MHz</p><p><br/></p><p>Working time: Charging once and working for about 2 months</p><p><br/></p><p>Charging time: Approximately 5 hours to fully charge</p><p><br/></p><p><br/></p><p>Ringtone volume: 7-level size adjustment (standby mode volume adjustment key)</p><p><br/></p><p>Call sound: 7-level adjustment of call size (adjust volume key during call operation)</p><p><br/></p><p>Product size: dimensions of the host and extension: 160mm * 110mm * 20mm</p><p><br/><br/><br/></p><p>Packaging size: 18.8cm * 11.8cm * 3cm Gross weight: 300g</p>