[vlabakje90]

Keep in mind that a single sensor will work for only a week or two, depending on the type. So it's not exactly right to compare the price to a smartwatch.

[temp_praneshp]

Ah okay, thanks for telling me that; I thought you keep recharging the battery every week from the description.

[pwthornton]

No. They are single-use, and it embeds into your skin with a probe.