Amazon has the refurbished Amazfit T-Rex 3 48mm Outdoor Smart Watch w/ AMOLED Display (Black or Lava) on sale for $160 with free shipping. Works with Android and iOS. 

• 2,000 nits peak brightness,  can resist 158℉ heat and -22℉ cold
• Water-resistant to 100m (freediving to a depth of 45m)
• 27 days with typical use, 42 hours in GPS Accurate Mode, and up to 114 hours in GPS Long Battery Life Mode