Feature 1Easy to install, just paste, no wiring, easy to use. 2This piercing, plug-in siren can be plugged into your keypad/Console. 3Durable and long service life. 4Works with your system, responding to signals from an alerted Keypad/Console. 5At 120 decibels, providing very loud voice prompt.Features: Easy to install, just paste, no wiring, easy to use. Compact, light and convenient to carry. Durable and long service life. Works with your system, responding to signals from an alerted Keypad/Console. At 120 decibels, providing very loud voice prompt. This piercing, plug-in siren can be plugged into your keypad/Console. Specifications: Material: Plastic and Metal Rated Voltage: 12V DC Sound Index: 120dB Sound Frequency: 3.8KH2+10% Transmit Speed: 3H2 increase or discrease 10% Size: 5.2*5.0cm/2.0*2.0in Package Weight: 64g/2.3oz Package List: 1 * Sound Alarm System