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TASCAM TC-1S Solar Rechargeable Tuner
The world's first solar-rechargeable tuner is the TC-1S from TASCAM. The TC-1S charges its battery from a bank of solar cells on the front panel, and a USB input is also available for quick-charging when you're completely in the dark. It's wrapped in a shock-proof silicone cover that's available in six colors and keeps the unit protected.