POWERFUL AND SAFE BATTERY-- Our powerful batteries support over 15 hours non-stop working time, about 300 standby time, and charge in about 2 hours. With MSDS certification ensures your health. best for trukers drivers. HD VOICE & NOISE REDUCTION--The bluetooth 4.1 techonlogy,stereo wireless voice, ensures high-qualified wireless audio experience, intelligent noise reduction ensures enjoying your own world when you are outdoor. Volume adjustment--you can adjust your voice in the headphone by switching the UP/DOWN button and don't leave fingers off the button for seconds. SWEATPROOF & WATERPROOF--Mamamiya bluetooth earbuds support IPX4 waterproof sweatproof, you don't need to worry the Light rain or sweat will ruin the headphones,while you are in a gym,running, jogging,workout yoga. please make sure not using in a pouring rain or soak in the water. COMBINATION USE--The Mamamiya 900S bluetooth headphone supports one set-one bluetooth and two sets-one bluetooh equitment (iPhone 7 Plus 6s 5s Samsung Galaxy S7 Edge S6 S5 Note5 LG G5 V10 Motorola HTC iPad tablet)combination use, which means you can enjoy the same voice with your partner at the same time. Don't worry it will not impact your call receiving, only the host can receive the call. (You can drop down to see the detail of combination use). LIGHTWEIGHT & NECKBAND DESIGNED--The bluetooth headsets Only o.1 LB, TPU Bendable extremely comfortable neckband. Your neck won't hurt after wearing neckband and the suitable earplugs for whole days traveling and working. Open box, box does show wear... Look at photos