We understand if you’d be hard pressed to replace your current luxury timepiece with a far less beautiful digital smartwatch. So don’t, and pick up Montblanc’s e-Strap instead. This device comes complete with a NATO strap of its own but works just fine with your existing 20mm to 22mm straps, adding to your wrist a 9mm-thin device with a 0.9-inch monochromatic display, a 5-day battery, an accelerometer plus pedometer, and Bluetooth 4.0. Functionality-wise, the e-Strap includes an activity tracker, subtle vibration notifications and previews of received messages, an activity tracker, and a remote for controlling music playback and triggering your phone’s camera shutter wirelessly. And it works with iOS and Android devices alike.