Ditch that ordinary boring calculator for one with serious style appeal! Winsome piano key styling puts fun into even the most mundane math tasks perfect for scholars and aspiring musicians alike. Weight 0.1 lb. 5 1/2 x 3 1/2 x 1/2 thick. ABS. Dual power source: Solar power panel and one LR1130 button cell battery included. Auto shut-off feature.