The Lanbailan earphone is equipped with Bluetooth 4.1 + EDR APT-X audio decode technology offering you perfect stereo sound. And it can connect with 2 cell phones or tablets at the same time</br>Fully exercise-proof: Sweat-proof earpiece design portable and lightweight wireless headset can be stay in your ears comfortablyour headphones will let you enjoy music through a variety of activities.</br>Strong Wireless Signal: you can enjoy skip-free music in a 10-meter working distance.Built-in Rechargeable batteryUp to 4 hours of Talk/play Time</br>Built for your active lifestyle the earbuds are rated IPX Level 4 and can withstand dripping sweat. Ergonomic design optimized for ultimate wearing comfort to match your active lifestyle like running jogging cycling driving camping hiking gym exercise and other outdoor sports.</br>High-fidelity stereo music and clear speech via Noise reduction</br></br>Product Description</br></br>devices.<br/> Specification:<br/> Bluetooth version: Bluetooth 4.1<br/> Chipset: CSR8635<br/> Operating distance: up to 33ft (10m)<br/> Standby time: up to 7 days Charging time: at least 1 hour Music time: up to 4 hours Talk time: up to 4 hours<br/> steps:<br/> 1. Check the headset to see whether it is in good connection or not: First?? when bluetooth headset is in off state?? short press the smart start button for around one second until the indicator light of headset in alternating flashing of red and blue color?? which means the