Lightweight Compact Design: Bulk-free compact construction weighs only 0.53 oz / 15 g for a comfortable fit that won't weigh you down while running, jogging, or working out. SunvalleyTek is the ONLY authorized seller of TaoTronics Brand products, 2nd hand purchase or purchase from a non-authorized seller/distributor will not covered by our warranty. Adjustable In-Ear Design: Come with 3 sets of different-sized, interchangeable eartips and ear hooks to choose and assemble for a snug fit that won't come loose Resistant Aluminum Alloy Build: Durable metal construction withstands wear and tear of daily usage for an appearance that looks new over time while staying fully functional Easily Identifiable Inline Controls: Conveniently placed, tactile buttons enable you to adjust the volume, play / pause / skip the track, and even answer / reject incoming phone calls Reliable Bluetooth 4.1 Connectivity: Energy efficient, easy-to-pair connection provides stable, smooth media streaming while freeing you of cables