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Thank you for purchasing this product. This is a 5.3KHz heart rate chest belt 
which is used to monitor heart rate and obtain heart rate data via the two 
electrodes on it. This product communicates with the receiver at 5.3KHz, and 
can transmit heart rate data to your heart rate receiving device (such as a 5.3K 
watch or a 5.3K receiving module on a treadmill) to display the current heart rate 
in real-time. IPX7 waterproof means that sweat is effectively prevented from 
penetrating into the device during exercise. Please read this manual thoroughly 
and keep it in a safe place. 
IMPORTANT: This product is for sports purposes only and is it not for medical 
use.
(Patients with cardiac pacing or other implantable devices should consult their 
doctors for recommendations)
Device Overview
1x Heart rate transmitter (CR2032 installed)
1x Adjustable chest belt
User Manual
5.3KHz Heart Rate
HRM 3.1
English Version No: V1.5
1x User manual 
Use
Important note: When the transmitter of the heart rate chest belt is not worn, it will turn 
off, go into sleep mode, and stop searching for wireless connections. As soon as the 
heart rate chest belt is worn correctly, it will start automatically again.
1. Moisten the electrode areas on the reverse side of the transmitter.
2. Insert the round clasps on the chest belt into the slots on each side of the main 
device and ensure that both clasps are securely fastened.
3. The transmitter on the chest belt must 
be located directly below your chest 
muscles and must have the MAXXUS logo 
facing outwards. The chest belt should 
sit comfortably but not be too loose. The 
electrodes must have permanent and 
direct skin contact. If the belt is too loose 
this will not be the case.
Caring for your device
This device is a high-tech instrument that should be handled with care. Follow the 
care instructions to ensure reliable monitoring and to maximize the life span of 
the heart rate transmitter.
Heart rate transmitter 
Separate the transmitter from the chest belt after each use and wipe it clean with 
a soft towel. Do not use chemical cleaners.
Chest belt
Rinse the belt under running water after each use and hang it up to dry. Never 
wash the belt in a washing machine or put it in a tumble dryer. 
 – Never use cleaning chemicals.  
(Cleaning chemicals may cause fast aging and shorten service life).
 – Do not over-stretch the belt or over-bend it in the electrode areas.
 – Do not store the heart rate transmitter when damp in any non-breathable 
material. Dry and store the belt and connectors.
Batteries
This device requires a CR2032 battery which is already installed in the heart rate 
transmitter. The battery life is 700 hours.
Battery replacement
A. To open the battery cover, insert a coin into the groove and 
turn it in anti-clockwise direction as indicated by the arrow 
“←” .
B. Press on the battery to take it out of the battery compartment.
C. Place a new battery into the battery compartment with the “-” pole facing down 
and the “+” pole facing up.
D. Align the “▲ ●” mark on the battery cover with the “ ” on the left side of the 
main unit and replace the cover. Insert a coin into the groove on the cover and 
turn it clockwise to align the “▲ ●” with the main casing “ ”. Please 
dispose of the old battery according to your local regulations.
Battery Regulations / Disposal of Used Batteries
As a distributer of battery and rechargeable battery requiring devices, we are 
obligated by law to inform you of the regulations and obligations which currently 
apply:
Used batteries may not be disposed of in household waste.
Consumers are legally obliged to take used batteries to a suitable collection point 
a local retailer or local authority. You can use this service free of charge. Alterna-
tively, you can return your used batteries to one of our stores. If you wish to return 
them by post, they must be stamped with sufcient postage.
Used batteries may contain pollutants or heavy metals that can be harmful to 
the environment and health. In addition, batteries contain valuable raw materials 
which can be recycled. 
The symbols shown on the batteries have the following meaning:
= the batteries may not be disposed of in household waste.
Heart Rate Transmitter Specications
Weight 42.8 g Battery Life 700 Hours
Heart Rate Range 30~240 BPM Waterproof 
Rating 
IPx7
Wireless  
Transmission 
5.3KHz Size  300 x 35 x 12,2 
mm
Transmission 
Distance 
90 cm Chest Belt Length  68 – 103 cm
All technology is continually subject to change.
Distributors
MAXXUS Group GmbH & Co. KG
Nordring 80, D-64251 Groß-Gerau, Germany
E-Mail: info@maxxus.de
www.maxxus.com
To avoid danger keep batteries away from children
Step two
Electrode 
Step one
Electrode