Used twice. Battery: Both earbuds lasted about 4 hours of continuous music playback without running out of charge. Noise canceling, external sound input mode, etc., all work perfectly. The case battery shows no degradation. Operation confirmed, no issues. No functional problems whatsoever. Contents: Earbud units and charging case. Includes brand new, genuine ear fins and ear tips. True Wireless Stereo Earphones MOMENTUM True Wireless 4 MTW4 Black Copper Brand: SENNHEISER MOMENTUM (SENNHEISER) Z7