Below I provide my personal experiences so yours may differ slightly. · Even with no battery life, with the built-in 3. I had a mix of software routing, ran it through a processor and interface. These shoes have convinced me to purchase at least two more pairs (different styles) for the manufacturer. Unbeatable size and quality-wise for the price! Extremely pleased. Very comfy with lots of cushion and rubber bottoms that prevent slipping. SAVE YOUR MONEY AND PLEASE DO NOT BUY THESE AGAIN. Trust me when i say this. Says they are very comfy.