<b>A Higher Quality Plug-in Wireless Doorbell</b><br><br> <b>Specifications:</b><br> ● Receiver Operating Voltage: AC 110- 220V.<br> ● Insert Type: US Protruding Plug. <br> ● Receivers Operating Power: 0.1W <br> ● Transmitter Power: 1pcs 23A 12V alkaline battery, 230mAh (Installed already). <br> ● Transmitter Battery Lifetime: Up to 3 years. <br> ● Operating Range: 500-1300 feet. <br> ● Operating Frequency: 433.92MHz with tolerance 280KHz. <br> ● Operating Temperature: minus 22-158 Fah or minus 30-70 Celsius. <br> ● Led Indicator: 1pcs, embedded in the transmitters and receivers respectively. <br> ● Sound Volume: 4 adjustable volumes with 25-115dB in cycles. <br> ● Waterproof Grade: IP55. <br> ● Ringtones: 58. <br> ● Receiver Weight: 2.1 Ounce <br> ● Transmitter Weight: 1.4 Ounce<br> ● Receiver Size: 3.7x2.5x0.8 inch<br> ● Transmitter Size: 3.11x0.98x0.83 inch<br> ● Product color: Ivory White+Silver <br> ● Installation: <br> 1)Use Sticky Pad to Adhere; <br>2) Use Screws to Fix <br><br> <b>Package includes: </b> <br> ● 2pcs plug-in receivers. <br> ● 2pcs transmitters (battery installed). <br> ● 4pcs long screws with compatible anchors. <br> ● 4pcs sticky pads. <br> ● 1pcs mini flat-head screwdriver (Pry open the transmitter bracket). <br> ● 1pcs User Manual. <br><br>