SainSonic Rainbow S&eacute;rie Lunettes 3D Actives pour Panasonic/Samsung/Sony/Sharp/LG/Toshiba/Philips 3D HDTV USB Bleu Improved Design: Portable,Light Weight and Comfortable for long time wearing. Better Viewing: Wider vision making the viewing experience Superior. Green consumption: Recharge with micro USB cable.3 hours recharging provides 35 hours operation. Easy Operating: Simple One Button Operation w/ Auto Shut Off, detailed user manual attached. We provide better customer service with 24*7 Email Support, feel free to contact us!