ULB-350 Low Cost Location Beacon


This underwater beacon is a cost effective free-running pinger used for marking equipment and underwater sites to depths of 1,200m. Using a single 9-volt battery, the ULB-350 can send a continuous acoustic signal for up to 60 days or on a programmed time delay for up to three months.

With flexible features that can be tailored to your needs, the ULB-350 is ideal for applications where size and weight are an issue.

Operating Frequency

27, 37, and 45kHz +/- 1kHz

Acoustic Output

163dB at 1 meter, minimum

Pulse Repetition Rate

1 Pulse Per Second (Adjustable)

Pulse Length

5 ms (Adjustable)


Water Switch with Programmable Time Delay

Power Source

9 V Alkaline or Lithium Batter

Operating Life

30 days minimum with Alkaline Battery
60 days minimum with Lithium Battery

Operating Depth

4000 Feet (1,216m)


8.5 oz

Housing Material




4.5 in (11.4cm)


2.0 in (5.0cm)

Specifications are subject to change without notice.

ULB-350 Programmer


The ULB-350 Programmer gives you the ability to change the operating parameters of the ULB-350 underwater location beacon as well as expand its capability.  Pulse length, repetition rate and activation time delay can be set by using the ULB350/PRG.  Portable and easy to use, the programmer is powered by either the provided AC power adapter or a 9-volt battery.

Program ULB-350 Repetition Rate from 1 Pulse every second to 1 Pulse every 30 seconds

Program ULB-350 Pulse Length User from 5 – 50ms

Program ULB-350 Activation Time Delay from 1 second to 90 days

Power:  AC Power Adapter or 9-volt Battery

Activation:  On/Off Switch

Display:  LCD

Length –  7″ (18cm)
Width –  4.5″ (11cm)
Height –  1.25″ (3cm)