Samsung Gear S2 R730T Smartwatch (T-Mobile) - Black / Dark Gray (Certified Refurbished) Tizen 2.3.1 Operating System - Circular, 1.2 inch Super AMOLED touchscreen display. Built in 4G connectivity so you can leave your phone behind (T-Mobile Network). Water-resistant and dustproof - P68-certified submersion up to 1.5 meters for up to 30 minutes. Access to important notifications, texts, and updates at a glance.