Charge source: DC 5V 150mA Charge time: About 4 hours Working current:about 35mA Anion quantity:about 50000/cm3 (by Aic2000& Kec 990 test) Unit size:58*47*16mm Battery:  3.7V/500 mAH lithium battery Battery working time: about 7hours  Charger(optional):AC 100-240V DC5V/350mA