Six-Month Warranty: Comes with a six-month warranty - plus upgrade to add a screen protector. Features: Includes a heart rate monitor, accurate built-in GPS, and is water resistant to 50 metres. 38mm or 42mm: See 'Specifications' for full dimensions. Three Colours: Choose between silver, gold and space grey styles. Apple Watch Series 3: Get a refurbished Apple Watch Series 3! Bluetooth and WiFi: Synchronise with your phone to answer calls, texts and receive notifications. Apple Watch Series 3 | Grey | Living Social