A:AnswerDon't know the weight, but 2 females can carry it without it even being a struggle.
Issue isn't weight, it is size - needed to borrow a pickup truck and it barely fit.
A:AnswerThe biggest differences the FT7 has over the FT4 include the Energy Pointer feature (which graphically displays on the watch face whether or not the user is in their fat burning or fitness improvement zone), additional memory as well as download capability to our free web service at www.polarpersonaltrainer.com (via our Flowlink accessory) - Mike @ Polar USA
A:AnswerYes you must wear the chest strap. Unlike a Fitbit or wrist base monitor, the Polar watch is for exercise use so you'll be wearing the chest strap
A:AnswerBelow is a helpful link to Polar's website that details this further - Mike @ Polar USA
http://www.polar.com/us-en/support/does_my_polar_product_contain_nickel?product_id=7882&category=tips
A:AnswerIt won't work as a HRM without the strap. Though you can use just the strap to get a heart rate on machines that can sync with Polar. Won't be able to get the other info without the watch.