This Apple Watch Series 3 42MM Cellular Stainless Steel in Very Good Condition comes with a built-in GPS, an optical heartbeat sensor and is water-resistant up to 50 meters. It also features a retina OLED display with Force Touch, a dual-core processor and even a speaker and microphone to make phone calls! Plus, the battery life is great too, with a lithium-ion battery that lasts up to 18 hours! Choose from the two colour options of stainless steel and space black.