Bowers & Wilkins P5 Wireless Bluetooth On-Ear Headphones, Black P5 Wireless combines the fantastic sound of P5 Series 2, with advanced Bluetooth streaming for unrivalled wireless acoustic performance. Impedance : 22 ohms (passive) Using high quality Bluetooth aptX, P5 Wireless allows you to stream Hi-Fi quality music from your smart phone, tablet or computer An incredible battery life of 17 hours of wireless playback between charges. P5 Wireless charges via USB and if you want to save your battery, it also comes supplied with a cable. P5 Wireless features drive units based on the award winning P7, designed with a diaphragm like traditional loudspeakers, resulting in more precise diaphragm movement and amazing sound quality. Bowers & Wilkins has more than five decades of experience creating the world's best loudspeakers, and they've put that expertise into the P5 Wireless for a stunning pair of headphones P5 Wireless headphones USB charging cable Universal audio cable Quilted pouchLiterature pack (Quick start guide, Safety and Registration booklet)