The Steepletone Duo can operate within a range of 10 meters in an open area. Perfect for listening by the pool, on a plane or even in your living room. The DUO is perfect for sharing, without the fuss of wires or headphone splitters. You can even control your own personal volume when pairing together so no more arguing over being too loud! But ensure you are not too close when pairing. A 3.5mm jack-to-jack lead is supplied for wired connection (Aux-in orout), should you not be able to use Bluetooth, or if you prefer to listen to music via devices without Bluetooth, such as old fashioned CD/DVD players, VCRs, iPods, radios & Hi-Fi systems. In addition, the headphones are lightweight, weighing only 170grms, which means you wont feel fatigued wearing them, unlike other brands, for prolonged hours. You can listen for up to 6 hours before they need charging again, an amazing battery life! So when you need to charge the headphones, they will alert you themselves with smart, low charge LED indicators, which are also active when charging. Total charge time will take Approx. 3 hours to be fully charged again, so ensure you put these on to charge at night before you go to sleep, ready to use in the morning again. You can charge these headphones via USB (Universal Serial Bus) cable. A micro USB (Universal Serial Bus)-to-USB charging cable is supplied, but a USB (Universal Serial Bus) charger plug is not included. The Steepletone Duo has incredible sound clarity & quality. The headphones have adjustable fit, for maximum comfort, & come with comfort-cushioned soft ear cups made for everyday use. A sleek, streamlined design thats durable & foldable to go everywhere & anywhere you want to go. You can even take calls hands-free, with the built-in mic. In addition, you can also control your music & volume from the side of the phone. Normally with wireless Bluetooth headphones, you can only connect your phone, tablet etc. to one pair of headphonesuntil now. With the new Steepletone DUO headphones, you can connect your phone tablet etc. to two wireless headphones. The Steepletone DUO is therefore perfect for sharing so why not share it with someone right now?