1. No any power is needed during the service life.
2. Don't worry no dry battery or bad connection.
3. Continued using more than 6 hours after basking.
4. Lamp-house: Super light LED, the lifetime more than 100, 000 hours (11years).
5. Solar battery made of crystal silicon, the lifetime is more than 20 years.
6. Nickel-cadmium or Nickel-hydrogen battery for saving solar, can be used 3~5 years.
7. Application: No electricity power, field, travel, gift, etc.
8. Saving money, convenience, utility.