TOP&reg; for HTC One M8 Shock Proof PU Leather Case with Bluetooth V4.0 Chipset Wireless Keyboard, More Fast and Stable Connecting, HTC One M8 Portfolio Case, HTC One M8 Detachable/Removable Keyboard Case, Flip Keyboard Case for HTC One M8. Perfect match to your HTC ONE M8 smartphone Standby time: 30 days. Uninterrupted working time: 30 hours Famous Brand Broadcom Bluetooth Chipset -- connection is more Fast and Stable Package Included: 1 x Bluetooth Keyboard Case, 1 x USB Cable, 1 x User Manual. Key Life: 5 million strokes. Operating Distance:10meters