


4iiii - Viiiiva Heart Rate Monitor
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
4iiii - Viiiiva Heart Rate Monitor4iiii Viiiiva HEART RATE MONITOR Take Your Training To Heart: The 4iiii Viiiiva is a precision instrument designed to capture the most accurate picture of your internal physiological effort. Whether youre pushing through a high intensity workout, pacing a marathon, or climbing the virtual mountains of Zwift, the Viiiiva provides the real time data needed to optimize performance, track cardiovascular fi tness, and manage recovery with professional
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- Fast: 2-3 business days
- Express: 1-2 business days
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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4.4 ★★★★★
Based on 2120 reviews
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Product Reviews
★★★★★ 5
Puts out a lot of light!
Style: 220 Lumens
I had to have an explosion proof light, and this one puts out an amazing amount of light! On flood light ( second push of button) it lights up an amazing amount of area around you. The spotlight will hit a tree in my back yard while standing in the front yard. Very impressive!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 21, 2026
★★★★★ 5
Intrinsically safe
Style: 250 Lumens
Works great and is hazardous environment safe
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 14, 2025
★★★★★ 5
Very useful if you don't want to explode!
Style: 90 Lumens
Found the unit a bit difficult to adjust on the hard hat but got it dial in eventually. Also impacted by the need to mount goggles on the helmet, that might be rare, but this was my situation working around chemicals.
nice and bright. batteries last a couple of days with intermittent use approx. 3.5hrs a day.
A bit of a pain to unscrew the cover on batteries but that's the nature of the beast to make sure no sparks escape.
Would highly recommend the product. Most other comparable products are around double the price.
BTW, the packaging looked like the driver dropped it on the road and ran over it a couple times...but it still worked.
UPDATE #1: After a few months of usage, the height adjustment is starting to fail. As I walk, the light begins to droop until it's shining down in front of me. Dissappointed that the adjustment didn't last longer. I might be able to discover a way to lock it back in, but have not taken the time to examine the mechanism yet.
UPDATE #2 9-2018: The adjustment problem has now reach its ultimate end. The hinge on bottom has basically disintegrated. Now, when I put batteries in and tighten the screw, the bottom hinge pops loose. The product is no longer usable. The hinge is just cheap plastic, that is a shame, I kind of expected better from nightstick. However, it still seems to be the best option vs. price available so I am planning to order it again. Hope I can get 3 years of intermittent use out of the next one. I do really like it when it is working...lite and bright.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 6, 2015
★★★★★ 5
Shipping
Style: 220 Lumens
Came in perfect condition works great not the brightest light but will work for me
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 17, 2025
★★★★★ 5
They do the trick. That's for sure.
Size: 3 mm 4.5 mm 6 mm Tire, Number of Items: 3
Fantastic. They vary in thickness to accommodate different size punctures, they look nice, good value for the money, the sand out the tire and internal belt to stop leakage. and they easy enough the use.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 26, 2025
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