SmartStereo Premium Speaker for Yoga,Metal Case,5W with 10-hours Playtime,66-Foot Bluetooth Range. Optimized Crisp and Clear sound performance.Special designed for Yoga practicer. In 3 years, 5 times improved design on acoustic detail. After 9 times matching testing. Perfect matching between proper inner space and driver unit with amplifier power output is done now. Time by time we improve each detail. Just for representing an incredible immersive audio performance. crisp. texture. warm sound quality with such small space speaker. Easily Carry Speaker. Bluetooth Official Approved.CE approved. 12.59 ounces only. Comes with a little gift carry bag. Easy Use Speaker. Supports all New Bluetooth v4.0 wireless Technology. And Standard 3.5mm Aux in Jack. Plays all Audio devices with 3.5mm audio jack. Up to 10 hours of playtime with 4 Keys control plane.Built-in microphone for hands-free speaker phone calling. Easy to pair - No code/pin needed (pin code 0000 for some model of windows phone) 4 keys control include volume up+ volume down + Play-Pause + Phone Answer  End function key. Built-in Li-Ion Rechargeable Battery.