Full Details from Amazon.com : http://www.amazon.com/gp/product/B00O0724S0?tag=onigi-20

SteelSeries?Stratus XL Wireless Gaming Controller

Pressure sensitive buttons for precise gaming control
Console-style left and right analog triggers
Bluetooth 21 EDR
Extended battery life of 40 hours with 2 AA batteries included
4 LEDs to display the player status during multiplayer gameplay
Dedicated OnOff Slider Switch to enhance battery life even further also includes Dedicated Pairing Button