Feature:
<br />  Long Range Operating: up to 500 feet working range(820 feet in open area), either you are occupied in the garden or at the kitchen, it reminds you that someone is calling from outside.
<br />  36 Different Chimes: Comes with 36 different ring tones with 4 levels of adjustable ringing volume(High / Medium / Low/ Mute), 110dB±5dB.
<br />  Configurable: Multiple receivers can be configured to ring with different chimes/ringtones to let you know which transmitter was triggered   a very convenient feature for multiple doorway entries.
<br />  Expandable: Each receiver can be worked with up to 4 push buttons, and each button can be worked with multiple receivers. The transmitter comes with over 1million frequency code which will not interfere with other equipment in your home or those of your neighbors, ensures that you will never miss any visitors.
<br />  Easy Installation: No batteries required for main receiver, just plug the receiver into an electrical outlet. Push button can be fixed to the doorframe with the attached adhesive tapes.
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<br />LED Lights
<br />  Blue Light: When you pressing the transmitter button, the blue LED lits
<br />  Red Light: When receiving the signal from the transmitter or setting the loop mode, the red LED lits
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<br />Specification
<br />  Working Current: Transmitting  13mA; Receiving  90mA
<br />  Receiver Working Voltage: AC 100-240V/ 60Hz
<br />  Transmitter Working Voltage: 12V DC
<br />  Frequency: 433.9±0.075 MHz
<br />  Working Humidity:  75%RH
<br />  Color: White
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<br />Package:
<br />1 x 2 Remote Button
<br />1 x Plugin Receivers
<br />2 x 3M Sticker
<br />1 x User Manual