The LK-JDW50B is a Omnidirectional Siren by Lion King
On fire-siren.com It Says:
LK-JDW50B siren is ideally suited for audible warning at refineries, oil rigs, in the event of fires and open-cast mining operations and can produces a powerful dual low frequency sound That is ideal for long distance signalling
(Please Note There are Spelling Errors due to The Translation from Chinese to English)