UPGRADED! Active Gear Brand Wireless Bluetooth Music Player Neckband (Headset Headphone Earphone Earbuds) USB 2.0 - PC, Smartphone, Tablets, MP3 Music Player, 250 Hr Standby, 4 Hr Talk, Green Supports 1GB-8GB MicroSD card Supports MP3 WMA WAV music format Ready to use directly as a USB portable disk. Built-in rechargeable li-on battery. Music playback up to 6 hours Incredible Value. The Best of Neckband Earbuds!