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Pros
Pro Comfortable and secure
The elastic band comes in three sizes and is soft and malleable. The H7 sits pretty snugly against your chest and doesn't slip around while you're using it.
Pro Very accurate
The H7 was tested against an EKG, the medical standard for measuring heart rate, and it was found that the H7's readings matched up with the EKG 99% of the time.
You can see the accuracy tests here.
Pro Waterproof, so it's great for swimmers
The H7 is properly waterproof, making it a good option for swimmers. However, when underwater, your Bluetooth connection won't work so you're forced into using one of Polar's GymLink enabled watches.
Pro Supports a wide range of connectivity options
The H7 can connect via Bluetooth Smart or GymLink. It can connect to a wide range of apps (like Runkeeper, Runtastic, or Strava) and works with Bluetooth sports watches as well. The GymLink connection means it'll work with Polar's other sport watches or activity trackers.
Pro Long battery life with replaceable cell batteries
The H7 runs on a CR2025 coin battery which, as long as you disconnect the device from the strap when not in use, should last you upwards of a month before needing to be replaced.
Cons
Con Bluetooth doesn't work underwater
Unfortunately, the H7 can't communicate via Bluetooth when it's submerged. You'll have to use one of Polar's other GymLink enabled watches to get functionality while swimming.
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