EPIRBs are generally installed on boats and can either be operated automatically after an incident or manually. In most countries they are mandated to be used in all commercial shipping. However, they are also used on yachts and leisure boats.
The basic purpose of a distress radio beacon is to help rescuers find survivors within the first 24 hours following a traumatic event during which the majority of survivors can usually be saved. Most beacons are brightly colored and waterproof. The units have a useful life of 10 years, operate across a range of conditions −40 to 104 °F, and transmit for 24 to 48 hours.
Some Examples of EPIRB is shown below: