Features and Benefits Fliphook™ Flexible two-way design allows you to wear the headphones either in-ear or behind-the-ear. Never hurt. Never fall out. Thanks to TwistLock™ and FlexSoft™ technologies, these headphones are lightweight and ergonomically built to ensure secure fit and stability no matter the workout. Sweatproof Designed to endure and outlast your high intensity outdoor or indoor workout sessions in any weather conditions. 6 hours of wireless playback Bluetooth® wireless allows you to stream high quality music without the worry of messy wires interfering with your workout. Hands-free calls In-line one button remote with microphone enables hands-free calling, allowing you to focus on your workout. A double press of the button activates Google Now or Siri. Magnetic Buds Magnetic earbuds that allow for easy cable management when not in use. What’s in the box: 1 x ENDURANCE RUNBT 3 x Sizes of ear tips 1 x Enhancer 1 x Charging Cable 1 x Warranty/Warning (W/!) 1 x QSG/Safety Sheet (S/i) Technical Specifications: Driver size: 8mm Driver sensitivity at 1kHz/1mW: 102dB Dynamic frequency response range: 20Hz –20kHz Maximum input power: 15mW Impedance: 16 ohm Bluetooth version: V4.1 Bluetooth transmitted power: 0-4dbm Bluetooth transmitted modulation: GFSK, π/4 DQPSK and 8DPSK Bluetooth frequency: 2.402GHz – 2.48GHz Bluetooth profiles: A2DP V1.2; AVRCP V1.5; HFP V1.5; HSP V1.2 Battery type: Lithium-ion Polymer battery (3.7V DC, 120 mAH) Charging time: 2 hours Talk time with BT on: up to 6 hours Music play time with BT on: up to 6 hours Weight: 19.7g