Microsoft Store has the Microsoft Universal Bluetooth Mobile Keyboard in black or gray, model no. P2Z-00001, for $39.99 (79.95 – 50% off) with Free Shipping for a limited time.

This wireless Bluetooth keyboard works with your iPad, iPhone, Android devices, or Windows tablet, and you can pair up to three devices with different operating systems at the same time. Plus, the detachable cover doubles as a smartphone or tablet stand. And its rechargeable battery works up to six months on a single charge.