The offer is for amazon prime customers. Not sure if its for specific accounts. Decent price IMO. Fulfilled by Amazon.
Looks like the instructions booklet is bit of challenge, based on review comments. But can't be a rocket science to figure out!
Description from Amazon:
Only suittable for baby, kids older than 3 months and adults. Don't use it on baby under 3 months especially newborn
Please clean the probe at least once a week, better each time before use. Because dusts on the probe can affect temperature calculation
Don't begin test if you just finish the probe cleaning, especially when you wash with alcoholic dishcloth, please kindly wait for 15 minutes. The probe is very sensitive, friction on it can also cause temperature change
When you use the Forehead Mode, please test with the Cover-Off device close on your forehead skin without any gap. The most accurate test position is between your eyebrows, although other position on the forehead is also feasible