This quirky looking eco-friendly calculator is powered by free energy. Simply fill the three water-powered batteries to the brim and plug them in to the face of your calculator!

Water-powered batteries consist of two electrodes that are made out of special alloy. When you immerse the electrodes in water they produce electricity through an amazing chemical reaction!

Just refill the batteries as the water evaporates from the cell (typically every 2 or 3 months). It's easy to tell when you need to top up since the batteries are clear like the calculator. Very cool!

With eccentric green buttons and similar battery plugs, this calculator is a fascinating feature for your desk. The batteries will last for a minimum continuous life span of two years!

Recommended for ages 10 and up.
Dimensions: 14cm x 7.5cm

SKU HYD01
Barcode # 612615045743
Brand SimplyCool
Shipping Weight 0.190kg

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(5) Kimberly - Verified Customer

Loves that we could find a game that was unique to that sold in stores. We expected a 2 week delivery being regional but received in light speed within a couple of days. Quality packaging also! Thanks for a great shopping experience, higly recommend!! :)...

(5) Jasmine - Verified Customer

Fast postage, great packaging, excellent customer service...

(5) Penny - Verified Customer

Product was exactly as described and the delivery was really quick. Coolthings will now be my go-to site when looking for that gift that is a little bit unique. ...

(5) John - Verified Customer

amazing product, price, packaging was perfect and delivered on time. Thank you ...

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Excellent Australian store...

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The mist lamps I bought for presents are totally mesmerising. The colours are soft and very pretty. The mist rising and swirling is really calming. Postage was quick and packaging was secure. CoolThings is a great site for gifts. I'll be back....

(5) Vicki - Verified Customer

I purchased the Unicorn night light for my seven year old Granddaughter. When she has sleepovers with us l leave a lamp on for her. She told me she is scared of the dark. Her father my son just says you will be fine she isn't. So l seen the beautiful Unicorn night light and thought this is the perfect gift. I believe it is working a treat for h...

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