The Razer Serval game controller is now available for purchase on the Google Store in the US. The controller is priced at $79.
The Serval is a Bluetooth controller for Android devices. It is primarily meant for the Razer Forge Android TV system but also works seamlessly with any Android smartphone or tablet. The controller has a holder attachment where you can clip on your smartphone and features a complete array of controls, including two joysticks, D-pad, four ABXY buttons, four shoulder buttons, controls to switch between up to four paired Bluetooth devices, and Android navigation controls.
If you want a high quality wireless controller for your Android smartphone or tablet, this could be it.