POLAR ☆ Chest Heart Rate Sensor ☆ Unused ☆

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I would be grateful if you could take the time to check my profile and product description, and make a purchase after careful consideration.

[Product Condition]
Model Number: H10N-HR
Size: M-XXL (67-95cm)
Color: Black

Battery: Up to 400 hours (battery-powered) *Battery can be replaced by the user.
Heart Rate Measurement: ECG
Main Features: Heart rate measurement via ECG, simultaneous connection to 2 devices via Bluetooth, connection to various devices via Bluetooth and ANT+, compatibility with 5kHz training equipment, water resistance 30WR
Main Uses: All sports requiring high-precision measurement such as running, cycling, triathlon, etc.
Wearing Location: Chest

Purchased for ￥14,000, but I no longer need it as I made a mistake with the color.
Unisex
This is a brand new, unused item.

[Product Rank]
S Rank (Please refer to the details below for rank descriptions. Please note that these are my own judgments.)

S... Unused, New
A... Deadstock (Unused, stored)
B... Beautiful item/Near-mint condition, appearing to have been worn for a short period.
C... Normal signs of wear and tear due to age.
D... Stains or scuffs that cannot be removed without cleaning.
E... Large scratches, medium-sized holes, or stains that have deeply penetrated the fibers (e.g., oil stains).
F... Not suitable for daily use, only usable for tasks where stains are not a concern (e.g., work).

*Size notation is based on the tag. If there is no tag, the size will be based on personal judgment and should be used as a reference only.

*American casual brands tend to have larger sizing than domestic brands.