(1)Built-in 4 LEDs light , no battery charged required
(2)Cranking 1 minute, can work 2 0 minutes,
(3)Built-in a output jack,, also can charge the mobile phone by connection
(4)Built-in lithium battery: 3.6V / 40mA.
(5)profile patent: ZL 2007 3 0124507.9
(6)CE & ROHS certification
Material: Plastic, Metal