Brief introduction Model: JY-JH-017, external mini-siren, which is specially designed for the users who need the large volume in certain position. It must connect with the alarm host to supply the power when it working. Feature  More larger volume than the built-in siren  Connect horn siren plug with host siren jack  Back up rechargeable battery can continue to support the main panel to work for 36 hours Specification  CE, CCC certified  Working voltage: DC 6V  Working current: 100-150mA  Volume decibel: ≥115db  Volume frequency: 3.8KH2+10％  Transferring speed: 3H2?0％