product link : http://www.amazon.com/dp/B013OF3N8S/
Original price $18.99- $12= $6.99
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- Provides two Diamond Crystals grinding heads (a rough one and a smooth one) to replace depending on your foot skin condition.
- Avoiding sharp blades, the high-speed rolling heard gently buffs away callus to keep your feet clean and graceful.
- IP65 level with water-proof and dust-proof allows cleaning the remover directly under the water.
- Motivated by two AA batteries (not provided), the callus remover lasts for long time between battery replacement.
- Package contents: Saicoo Electric Callus Remover, user manual, 18-month hassle-free warranty, and lifetime technical support.