Specifications: 1) Input voltage: AC100-240V 50-60Hz 2) USB output parameter: charger: DC5.0V or 5.5V 500-1,000mA 3) LED display: a) 1 LED 1 color indicates power on b) 1 LED dual color, red LED will light up to indicate charging is in processing, green LED will light up to indicate charging is completion 4) Constant charging current and charging voltage, short-circuit protection 5) Suitable for charging MP3 which with 2.0 USB socket Packing: white boxes producing area:China payment:T/T, L/C supplying capacity:500,000pcs/month