BIGGERFIVE Vigor 3 Kids Fitness Tracker Watch
- 240 hour battery life
- 0.95 inch display
- Optical and accelerometer sensors
- Works with or without a smartphone
- 0.02 kilogram weight
- 12 month warranty
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A very light blue tracker with a long battery that works with or without a phone. The listing gives no water rating or GPS, and does not name the metrics tracked, so check those first.
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ASIN: B0FLDS2CKLModel: KR05Category: Fitness Trackers
Overview
BIGGERFIVE sells the KR05 as a small blue fitness tracker with optical and accelerometer sensors and a lithium-ion cell. A charging cable and a manual come in the box, and a smartphone is optional.
A long battery and a very low weight suit all-day wear. The limitation is thin detail: no water rating, no named metrics and a small display.
Who it's for
Step counting and simple daily tracking are the setting, paired to a phone or on its own. Anyone who wants sport modes, route data or confirmed waterproofing should look at a model that lists them.
Pros and cons
- Long battery life
- Works without a phone
- Cable and manual included
- English language listed
- Water rating not listed
- No GPS mentioned
- Metrics tracked are unnamed
- Display type is unstated
Performance notes
Optical and accelerometer sensing handle pulse and step counts, and readings are estimates that drift with fit and arm movement. A small display and a modest cell stretch battery life, and use with a phone adds syncing but is optional.
Specifications
| Brand | BIGGERFIVE |
|---|---|
| Model | KR05 |
| Dimensions & fit | |
| Display Size | 0.95 inches |
| Item Weight | 0.02 kilograms |
| Power & efficiency | |
| Battery Average Life | 240 hours |
| Battery Description | Lithium-Ion |
| Construction & materials | |
| Color | Blue |
| Compatibility & installation | |
| Compatible Devices | With or without smartphones |
| Included components | |
| Included Components | Charging cable, Fitness tracker, User manual |
| Unit Count | 1.0 Count |
| Warranty & support | |
| Warranty Description | 12 months warranty |
| Other details | |
| Sensor Type | Optical, Accelerometer |
| Language | English |
Closest rivals on specs
Garmin Venu 4 GPS Smartwatch 41mm- Item Weight 0.04 vs 0.07 pounds (-43%)
Osawalla Smart Ring Fitness Tracker- Battery Average Life 10 vs 7 days (+43%)
- Item Weight 0.04 vs 0.01 pounds (+300%)
Samsung Galaxy Fit 3 Fitness Tracker 40mm- Battery Average Life 10 vs 13 days (-23%)
- Item Weight 0.04 vs 0.11 pounds (-64%)
Frequently asked questions
How do I care for the BIGGERFIVE KR05?
No care instructions or water rating are listed, so keep it away from water until the seller confirms its resistance.
Does the BIGGERFIVE KR05 need a smartphone?
No. The listing says it works with or without a smartphone.
What comes with the BIGGERFIVE KR05?
A charging cable, the fitness tracker and a user manual.