One of the best gamepads you can get from China, and from Xiaomi. It's retail price is about £15-20. It can be used with any smartphone/tablet, and I read that there is some software that allows you to use it with your pc as well.

Basic Information:
Bluetooth V3.0
G-sensor function
Double motor vibration
Three-axle G-Sensor
Powered by 2 x AA battery (not included)
Perfect compatibility with Mi TV / Mi TV Box
Compatible with all google standard interface devices
And other video game devices with Bluetooth function

Top Toughening Material, The World's Leading Molding Process
Classic streamline modeling accord with ergonomic design. Toughened shell that can effectively prevent scratches, surface texture processing, free from finger prints. All this makes with nice appearance and great hand feeling. Reasonable button layout and distribution with comfortable finger up, won't feel tired for long time playing.

High Precision D-pad with Four Positioning Balls
Four positioning balls as supports to ensure uniform clearance around. High positioning precision when rotating 360 degrees.

Perfect Hand-feel
Unique joint fingers curve radian design. Moderate pull for trigger buttons. Longer button for larger finger contact area, more comfortable and not easy to slide. Precisely control the brake and accelerator in racing games with exquisite gaming experience.

360 Degrees Global Positioning Rocker
High precision positioning rocker, 360 degrees full domain. Shaking accuracy reached up to 0.172 degrees. 0.5 degrees center special anti-interference design, avoid mishandle. Adopts the double injection molding process, with soft part on the top and hard on the bottom. Unique soft colloid feeling worm shape design , feel soft and comfortable. Thick texture on the surface effectively avoid the slip of the fingers.

Human Body Engineering Key Layout
A/B/X/Y direction key adopt mirror polishing technology, with nice appearance. The button layout perfect accord with human body engineering design, adhere to thumb sliding radius. Perfect user experience, full of comfort.

Durable Buttons and D-pad
Use material from top suppliers in the industry. Strictly subjecting to the requirement of all the process, A/B/X/Y, the direction key, L1/L2/R1/R2 are made with high toughness silicone material. All pass the severe pressure test, and can withstand the pressure at least 1000000 times normal use time all buttons for at least five years.

Top Asymmetric Double Motor Vibration
Super realistic vibration and impact. Uses first-class vibration motors, asymmetric design: the left motor load is light, the right motor loads is heavy (can be adjusted through software). With more vivid experience feedback for players in the car, extreme sports, shooting, etc.

One of the Best Built-in Accelerometer
Adopts top brands Bosch G Sensor (accelerometer) with three-axle gravitational acceleration. High precision calibration for optimal gaming experience.

Ultra Low Power Consumption
Intelligent power management system. 1 year long standby. The gamepad will switch to power saving mode automatically in 5 minutes without action. One key to awake your MI gamepad, fast and convenient. Powered by AA batteries (support rechargeable NI-MH batteries).

Super Compatibility
One key connection, online upgrade, support multi-point connection, fast and convenient. Perfect fit with MIUI TV system, and can replace most of the remote control function. At the same time support online upgrade automatically.