ULB-350 Underwater Beacon


The ULB-350 underwater beacon is a compact, rugged and reliable acoustic signalling device used for marking equipment and underwater sites. Ideal for applications when size and weight are an issue.

The ULB-350 can be ordered in many configurations in terms of acoustic power output, frequency, and time delay. Using an off-the-shelf 9 volt battery adds the advantage of cost-effective maintenance. The ULB-350 continuously sends out an acoustic signal for up to 40 days.

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  • Operating frequency: 9 or 45kHz +/- 1kHz
  • Acoustic output: 163dB at 1m
  • Pulse repetition rate: 1 pulse per second
  • Pulse length: 10ms
  • Activation: Water switch (other options available)
  • Power source: 9V alkaline or lithium battery
  • Operating life: 20 days with alkaline battery 40 days with lithium battery
  • Operating depth: 1216m
  • Weight: 217g
  • Housing dimensions:
  • Length: 7.9cm
  • Diameter: 4.3cm
  • OptionsFactory-set frequencies from 9 to 45kHz.
  • Time delays from 1 minute to 3 months.
  • Extended operational life.