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	Good design compatibility with Small Wearable electronics Offers opportunity for further miniaturization       Through using PD3048 instead of NiMH battery,     this MP3 player can be 2.5 times smaller and runs 1.2 times longer     For compact design, battery should be placed very tightly. In tight situation, battery can be often exposed to scratch and dents Due to hard metal case, Powerdisc is free from this risks.     Dimensional stability (little size variation)