Garmin Forerunner 55 GPS Running Smartwatch, Black

The Garmin Forerunner 55 is an entry-level GPS running watch with built-in GPS, heart-rate monitoring, pace guidance, and up to two weeks of battery life in smartwatch mode. This Amazon.sg listing discounts it from SGD 361 to SGD 230.64, which works out to roughly a third off a current, still-supported model. Note that it ships from Singapore, so check import shipping and any warranty coverage before buying.