3.2V, low voltage design, safe and reliable. Use LiFePO4 battery, high safety, long lifespan. 1. Cast aluminum case, safe,stable and durable. 2. Be able to work under about 70℃ high temperature. 3. Over 5000 times cycle time. 4. High-quality BYD battery cell. 5. With CE,Rohs,UL,UN38.3,MSDS certification. 6. Offer 5 years warranty.