2
WARNINGS:
Improper t of this device will reduce its effectiveness. Consult the following
instructions below for proper t.
Individuals exposed to loud occupational or recreational noise, should have annual
hearing checks to monitor their hearing levels over time.
All TETRA devices must be worn and maintained in accordance with instructions.
Cleaning regularly and paying close attention to maintenance ensures best
performance.
1. Battery Instructions
Each device uses a size 13 battery.
TETRA recommends using brand-name batteries as others may vary in size. While
TETRA devices are not hearing aids, they do use the same type of battery commonly
used in hearing aids. Such batteries are designed to have a long shelf life, but they
can go “stale” if on the shelf for a long time. Be sure to check the expiration date.
Pulling off the plastic tab activates the battery. Do not pull the tab off until you need to
use the battery. Check to make sure no adhesive from the plastic sticker is remaining
on the battery blocking the activation holes.
2. Battery Life
With daily use, the battery should last 7-10 days. With intermittent use, batteries may
last for up to a month once activated. Even if not used, once the battery is activated,
it has a limited life. We recommend new batteries if the device has not been used in
several weeks.
Low Battery Indicator- If you haven’t used your TETRA devices in a few weeks and
aren’t sure how old your batteries are, don’t worry, we’ve got your back. All TETRA
devices include a low battery indicator. A warning of three double beeps every eight
minutes indicates that the battery needs to be replaced. If you do not change the
battery, you will hear another warning of six double beeps, at which time your TETRA
device will turn off.
TETRA Tip: Once you remove the tab, let the battery sit for a couple minutes
before inserting it into the device. This can help your battery last longer.
