Premium Grade A+ battery cell.True capacity,Multiple-protection We attach great importance to the quality of batteries, and adhere to the concept of quality to win, committed to creating high quality products. Founded in 2000, we are a battery specialized factory with more than 24 years of history.Over 15,056 battery models.Professional battery factory. Product Specification Compatible Models:Logitech MM50, Pure-Fi Anywhere Speaker 1st Compatible Part Numbers: NTA2479 Battery Capacity:2200mAh / 8.14Wh Standard Voltage:3.7 Battery Type:Li-ion Warranty：12 months What's in the box 1*battery in retail Box