AirPlay Mirroring is built in to the device. No extras needed.
Reflector is an AirPlay receiver that accepts wireless mirroring and streaming connections. It uses technology that's built in to your computer, iPad, iPod or iPhone to wirelessly display content. Under the hood, it works much like an Apple TV. There's no complicated set up or need for adapters and wires. Once installed, simply connect your device and mirroring begins. Most newer Apple devices support mirroring and work with Reflector. Find a complete list of compatible devices here.
Reflector enables iOS mirroring ON