1. Dapper ,portable and endurable 2. Can hung on the neck,only 40g 3. No harm and help sleep better 4. With USB interface

Specification

Charge source : DC  5V 150mA

Charge time : about 4 hours

Working  current : about 35 mA

Anion  quantity :about 50000 / cm 3 ( by Aic 2000 & Kec 990 test )

Unit size : 58*47*16 mm

Battery : 3.7V / 500mAH lithium battery

Battery working time : about 7 hours

Charger ( optional ) :AC100-240V  DC5V/350mA