The PoolMate2 features all the patented lap-counting technology of our existing models with the addition of an open water mode to track swims in lakes the sea or rivers
With a crystal glass face larger clearer display and chrono mode for other activities it's a great watch
The black model comes with reverse display (white characters on black display) and does not have a back light
Grey blue and purple models have standard display and back light.Weight 41g Diameter of face 40mm Strap fits wrists from 14.5 to 21.5cm