"The system consists of an ultra-comfortable band that measures 2.5 inches wide. Two varying lengths are available, depending on your upper arm circumference. The L/XL size fits my arm the best, but there is also an S/M size available. Also: The best smart rings of 2025: I tested and found an obvious winner The band weighs only 16 to 20 grams, depending on the size, and I cannot stress enough how extremely comfortable it is to wear every night."
"Battery life is accurate and the light monitor charges quickly The Index Sleep Monitor module is also light at 14.5 grams (0.5 ounce) and charges up with a standard Garmin charging cable. Garmin advertises up to seven nights of sleep tracking with eight hours of sleep. I generally sleep about 7.5 hours per night, and the advertised battery life has been accurate."
Garmin's Index Sleep Monitor is an upper-arm band designed to track sleep for up to a week and sync data with Garmin Connect and compatible smartwatches. The system includes a 2.5-inch-wide ultra-comfortable band offered in S/M and L/XL sizes and a 14.5-gram monitoring module that charges via a standard Garmin cable. The band weighs 16–20 grams depending on size and is suitable for nightly wear as a subtle alternative to rings or watches. Garmin advertises up to seven nights of tracking based on eight hours per night; real-world use with roughly 7.5 hours showed accurate battery life. Sleep detail access without a Garmin watch is limited to the smartphone app.
Read at ZDNET
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