Bluetooth Headphones, V4.0 Wireless Stereo Bluetooth Earphones [Magnet Attraction] Sport Headset in-Ear Noise Cancelling Headphone Earbuds for Gym Running -Sweatproof, Microphone (Red) MUSIC & CALLs CONTROL: Wireless Bluetooth Earphones allow auto switching between music and calls. You can control all functions of music and calls easily via the button of Bluetooth headset. Built-in microphone enables taking hands-free calls while listening to radio. THE LATEST TECHNOLOGY OF CSR: Advanced bluetooth version 4.0+EDR system, backward compatibility V4.0, V3.0, V2.1, V2.0, V1.2, V1.1. Integrate 80MHz RISC MCU and 80MIPS Kalimba DSP. Simultaneous connection of two mobile phones, never miss any important calls. HD STEREO & NOISE CANCELLATION: Adopted CVC Version 6.0 NOISE CANCELLATION technology, guarantees HD stereo sound quality and provides steady Bluetooth signal and support stereo lossless music. Comfortable Fitness: MAGNETIC ADSORPTION design, the earplug can be magnetically attached to each other back-to-back, forming a loop around your neck.Sweatproof or water resistant technology makes lightweight wireless headphones wearable during workout and sports activities like running, jogging, gym exercises. LONG-LASTING USAGE & LIGHTWEIGHT: about 6 hours talking time, 4 hours play music time, 200 hours standby time, 2.5 hours charging time, so you have less time charging and more time doing. Light weight, in-ear design, A perfect partner for your running or using at the gym.