Microsoft is the latest technology giant preparing to jump into the wearables market, with plans to offer a sensor-rich smartwatch that measures heart rate and synchs with iPhones, Android phones and Windows Phones, Forbes has learned. It’s a surprising development in the ongoing conversation about wearables that till now has been dominated by Samsung and Apple. The device will draw on optical engineering expertise from Microsoft’s Xbox Kinect division to continuously measure heart rate through the day and night, according to multiple sources with knowledge of the company’s plans, while the battery will last for two days, roughly on par with Samsung’s Gear Fit. The timeline for the watch’s release date is unclear but Microsoft could be gunning for as soon as this summer. Crucially, it appears the smartwatch won’t just tie in with Windows Phone devices, but will also work with both iPhones and Android smartphones.