Shower RadioFunction & Feature:Cranking for power generation Support bracket and hanging hook Splash-proof, suitable for bathroom use Cranking for power, no external batteries are needed, store energy by built-in rechargeable battery; green, environmental friendly, economy, safety,reuse limitlessly Low power consumption, you can also crank for listening to the radio when battery goes dead. Low noise but high efficiency; Low power consumption; Long working time. Main Technical Parameters:1) Radio: 1. Sensitivity of the FMBetter than 10 uV2. Sensitivity of the AMBetter than 1.5 mV/m3. Reception scope of the FM88-108 MHz4. Reception scope of the AM530-1610KHz5. The audio frequency output powerMore than 100 mW6. Radio working time after 1 minute cranking (2.5 - 3 circles/s)About 18 minutes7. Radio working time after being charged fullyAbout4 hours2) Charged by outside power: Input voltage5V Fully charged time About 8 hours 3) Main parts life-span: Switch5000 timesThe whole unit5 yearsThe plastic part5 years