Powered by Sennheiser TrueResponse transducer, a 7mm dynamic audio driver that delivers a high-end sound experience with full bass Open and Closed ear adapter options let you choose an Open style when you want higher running comfort with more situational awareness or a Closed style that blocks outside noise for a focused and immersive audio experience. Each style of ear adapter is available in 3 sizes for an optimal fit. Interchangeable fins and a choice of ear adapters let you achieve a perfectly secure fit in sport or everyday use. Sennheiser Signature Sound: Powered by Sennheiser TrueResponse transducer, a 7mm dynamic audio driver that delivers a high-end sound experience with full bass. Adaptable Acoustics: Open and Closed ear adapter options let you choose between either higher running comfort with more situational awareness or blocking outside noise for a focused and immersive audio experience. Secure Customized Fit – Interchangeable fins and a choice of ear adapters let you achieve a perfectly secure fit. Headphone FeaturesSilicone ear pieces. USB-C cord. Detachable cable. Connection: true wireless. Bluetooth enabled for a wireless connection to your devices . Connects to devices via Bluetooth. With a USB-C connection. 7mm driver. Touch controls on side controls. Passive noise cancellation. 10m range. Carry case. Bass control. Compatible with universal smartphones. Batteries required 3 x Li-Ion battery (included) . Rechargeable battery. 27 hour battery life. 90 minute charging time. Charging case included. In the box: Pair of earbuds Charging case with lanyard USB-C charging cable Closed and Open ear adapter sets (S/M/L) Ear fins sets (N, S1, S2 , S3) Quick guide & Safety guide. General InformationManufacturer’s 2 year guarantee. EAN: 4260752330671. Warning - Not suitable for children under the age of 3 years due to small parts and entanglement hazard.