... Two Way Power System,with solar cell and one Single AG10 button cell(LR 1130)• Battery Life:Approximately 17000 hours continuous display ... mm• Weight Approximately118.8g(4.16 oz)(including the battery)• Housing&Buttons material:ABS2.The features :• 12 digits ... Auto Replay function • Dual Power supply( solar and backup button cell battery supply)• 3-key memory, Percentage, Square Root, Sign Change3 ...