Mini Power Station Creative DIY Plant Digital Clock Desktop Potting Specification: Brand: Winmartdesign China Material: ABS Size: 170*80*85cm Color: White Feature: No batteries, no solar power, 100% powered solely by the plant itself Just regularly water the plant, keep the plant live and the plant will keep your clock on By using two kinds of different active metal, through the plant of wet soil as the carrier, mini power station can produce a power to start the clock. Enjoy the eco-freindly system and DIY fun. Package included: 1 X Plant Pot 2 X Pack of See ds(Black malts and bean sprouts) 1 X Nutrient Soil Tips: 1. Seed growth condition: temperature((greater-equal sign)15), humidity((greater-equal sign)50%) 2. If the LCD screen is dim, please water the plant, or wipe the silver metal strip by using abrasive paper. Notice: 1. The item only a simple clock function, not alarm clock function. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please consider this before the purchase. 3. Please allow 1-2cm differs due to manual measurement! working principle: