The combination of low market share and lack of the Bluetooth Serial Profile has meant Windows Phone users have had few to no options for interfacing with external peripherals.
Now however Runtastic has taken the first step to supporting Windows Phone 7 users with their Heart Rate Monitor and Receiver.
The Runtastic Heart Rate Monitor is a small heart rate monitor device that can be plugged into your Windows Phone that fully integrates with the runtastic app software and integrates with runtastic users personal online fitness log and performance data.
The device uses the 3.5mm headphone jack, which means near universal support for most smartphones and also features a headphone pass through, so you can continue listening to your playlist while monitoring your heart rate.
The accessory is only â‚¬59.99 and of course needs the Runtastic Pro app, which is $4.99.
Read more about the accessory at Runtastic here.