Own a Google Chromecast and want to be able to cast your screen. Then you need the following devices –

Nexus 4
Nexus 5
Nexus 7 (2013)
Nexus 10
Samsung Galaxy S4
Samsung Galaxy S4 (Google Play Edition)
Samsung Galaxy S5
Samsung Galaxy Note 3
Samsung Galaxy Note 10
HTC One M7
HTC One M7 (Google Play Edition)
LG G3
LG G2
LG G Pro 2
Sony Xperia Z3
Sony Xperia Z3v
Sony Xperia Z3 Compact
Sony Xperia Z3 Tablet Compact
Sony Xperia Z2
Sony Xperia Z2 Tablet
Support for additional devices coming soon

In addition Android OS 4.4.2 or higher required. Casting your mobile screen is currently in Beta. Casting your mobile screen is currently not supported on iOS devices.

Via Google