Polar H9
400 h on a replaceable battery, with Bluetooth, ANT+ and 5 kHz. It has no internal memory; the H10 stores one session.
What the maker states
| Battery | 400 h, Replaceable coin cell |
|---|---|
| Weight | 60 g, With strap; 21 g without |
| Water rating | WR30 |
| Heart rate sensor | Electrical, chest strap |
| External sensors | Bluetooth, ANT+, 5 kHz |
| Internal memory | No memory |