Now just stop worrying about wires hanging from here and there. Wired is pass'. Connect with any Bluetooth device, connect and play. Dead batteries can kill your vibe. boAt Rockerz is designed to play for up to 8 hours. It has a high definition sound. Don't just be loud, be loud and clear. We guarantee you have not heard such powerful bass and vocal clarity from a wireless headphone. The boAt super bass Rockerz 400 wireless headphones will make your listening experience personal and for real. Plug it in and plug into nirvana.