To get the best performance from any heart rate monitor chest strap, it helps to understand how it works and how to wear and care for it correctly. The tips below reference the M7, but the same principles apply to all chest-strap heart rate monitors.
✅ Fit Matters
For accurate readings, the strap needs snug, secure skin contact—not loose, and not so tight that it affects breathing.
The strap should stay in place during movement and not slide down or shift.
If the strap is too loose, the heart rate signal will drop or become inaccurate.
Strap Sizes Available
If you need a different size or a spare strap, you can order below:
| Size | Measurement | Link |
|---|---|---|
| XS–S | Fits 20"–28" (51–71 cm) — stretches to 30" (76 cm) | https://eza.infusionsoft.com/app/orderForms/m7-replacement-strap-small |
| M–XXL | Fits 26"–36" (66–92 cm) — stretches to 60" (153 cm) | https://eza.infusionsoft.com/app/orderForms/M7-strap-regular |
? Correct Placement
Wear the strap just below your chest, with the sensor centered over the bottom of your sternum.
For women, you can position the strap just under the bra band for comfort and stable contact.
Some people get a stronger signal by shifting the sensor slightly to the left of center, closer to the heart.
Note that it is also acceptable (and maybe preferred) for women to slide the M7 strap and transmitter under the bottom of a bra.
? Important Before You Start
The M7 must be turned on before it can connect to the Morpheus app.
Putting the strap on your body activates it once the transmitter is snapped in place and detects your heart rate.
? How to Put On the M7 for Best Performance
Follow these steps for fast connection and accurate readings:
Put the strap on first (without the transmitter attached).
Adjust it so it feels snug and secure.Moisten the electrode areas (the rubber sections on the inside of the strap).
Use water or electrode gel.
Get your fingers wet and rub water onto both sides of the strap where the electrodes sit against your skin.
Moisture improves the electrical signal, especially if you’re training in a dry or cool environment.
Optional: Add a little moisture to the outside/front of the strap to reduce static interference from clothing.
Attach the transmitter to both snaps, right-side up.
The Morpheus logo should be readable by someone facing you.
The “L” snap goes on your left, and the LED light will be on your left side.
? What You Should See (LED Light)
White blinking – Searching for your heart rate
Blue blinking for ~10 seconds – Heart rate found and connection established
Light turns off – Device stays on and continues tracking (this is normal)
If the strap is clean, moist, and not worn out (most straps last about a year with regular use), your heart rate should connect quickly and stay accurate throughout the workout.
? Basic Care and Maintenance
Keeping the strap clean helps maintain accuracy and extends its lifespan.
After each workout:
Fully unclip the transmitter from the strap
Rinse the strap with warm water
Gently wipe it off
Air-dry completely before storing
Every couple of weeks, give the strap a deeper clean to remove sweat oils and residue from the electrodes.
Full cleaning instructions can be found here:
https://trainwithmorpheus.com/topic/m7-heart-rate-monitor/