http://www.100-gift.com/rss/125/455/Rechargeable-Calculator_1.xml Rechargeable Calculator Wholesale,china Rechargeable Calculator Suppliers, Manufacturers, Exporters en-us Promotional Gifts Center http://www.100-gift.com/custom_product/125/455-1/Rechargeable-Calculator-2228.html This promotional 8 digit display calculator uses Faraday? Principle of Electromagnetic Energy to operate. A magnet moving by a copper wire produces an electric current that powers the calculator. Shake it left to right non- stop 20-25 times, and enough electricity is generated to operate for 10 minutes. When the digits on the LCD screen dim, just shake it a few more times to recharge - their calculations won't be lost during recharging. Designed with a rubber grip, and a clear viewing window. Color: Gray w/ Red, Gray w/ Blue and Gray w/ Silver. Size: 3-1/4" w x 5-1/4" h x 3/4" d Packaging: Bulk packed. 23 lbs. / 80 pcs