Rebell ECO610 - Water powered calculator

Fascinatingly simple and in line with the latest trends! It requires no batteries, which helps protect the environment and save money. It also makes a great little gift or souvenir. Exciting and educational for young and old! This calculator features an eco-friendly hydro power system and a very large 8-digit display. It uses regular water for free and only needs a few drops of water per week, making the Rebel Eco 610 environmentally friendly. The calculator is also made from recycled materials. It includes an 8-digit display, a large LCD display, a percentage key, a plus/minus key, a decimal point, a square root function, and four memory keys. Additionally, it has an automatic shut-off function.