The FURUNO LH5000 has a powerful loud hailer

The LH5000 is made to instantly draw attention to your vessel by sounding your voice or one of eight internationally recognized warning signals through the horns. With the LH5000, you can instantly alert nearby vessels of your presence and status, regardless of conditions such as limited visibility, dense fog, or the darkness of night that might otherwise mask your presence. Using up to six powerful horn speakers with an impressive 30 watts of output power each, the LH5000 is sure to grab the attention of everyone in your vicinity.