• Patented ultra-light, durable solar module designed from NASA spin-off technology           • Automatically recharges itself when in sunlight, even while listening         • When fully charged the headphones will play for more than 20 hours inside and outside         • 1 hour of charge in full sunlight provides 1-3 hours of listening     • Extended Bass for superior sound     • Dual headband for added comfort     • Internal antenna for powerful reception     • Eliminates unnecessary battery waste     • NiMH battery contains no lead or cadmium     • Automatically recharges itself by sunlight     • Sporting Events     • Walking/Running     • Hunting/Fishing     • Gardening/Lawn Care