Item Type: Smart Call Doorbell <br>Weight: Approx. 140g / 4.9oz <br>Material: ABS <br>Open Connection Distance: 200m <br>Obstacle Connection Distance: 20-50m <br>Two-Way Intercom: Support <br>Wireless Distance: Approx.200m / 656.2ft <br>Working Temperature: -20-55 Degrees Celsius <br>Working Frequency: 467.6375MHZ (No Waterproof Function) <br>Power Supply Voltage: 1.5V <br>External Unit Power Supply: 4xAAA Batteries (Batteries Not Included) <br>Internal Unit Power Supply: USB Cable Power Supply <br>Volume Adjustment: Support <br>Change Ringtones: Support <br>Scope of Application: It is suitable for residences, factories, hotels, hospitals, tea houses, shops and public places. <br>Operation steps: Press the intercom button, the button light is on, it means the machine is normal, the button light is off, it means the battery is not installed, you must install the battery first. <br>When pressing the outside machine: <br>a. The indoor unit will keep ringing without pressing the intercom button. <br>b. Only after pressing the intercom button on the indoor unit can the intercom call <br>Code pairing method: First press and hold the indoor unit and turn on the power switch for 5 seconds, then let go, the button light flashes quickly to enter the code matching mode, and then press the button of the outdoor unit indoor unit from fast flashing to off to indicate successful code pairing. The code matching method for multiple indoor units is the same.<br>1、Easy to install, the doorbell can be pasted on the wall with strong adhesive paper, or you can install it freely according to your needs. <br>2、Ultra?long transmission distance, strong and stable signal transmission in large houses, coverage of up to 200 m when there are no obstacles, and visitors' doorbells can be answered at any distance. <br>3、Multi?connection mode, by learning its code, outdoor bells can be paired with multiple indoor bells without interfering with each other. <br>4、Low energy consumption and long standby time. The outdoor bell is powered by 4 alkaline batteries (batteries not included). It is very convenient to replace the batteries and can last up to six months. The indoor bell is powered by a rechargeable lithium?ion battery and uses smart power?saving technology. <br>5、Two?way voice intercom function, wireless voice doorbell, talk with visitors through two?way voice intercom, know who is visiting your home and talk to them.<p>1 x Indoor Unit</p><p>1 x Outdoor Unit(Batteries Not Included)</p><p>2 x Double-Sided Tape</p><p>1 x Screwdriver</p><p>1 x Manual</p>