... 10 mins l Hand crank dynamo can provide 2 LED to shine,l LEDs never need replacing ,no battery ... required.l Just crank 1minute and 2 super-bright LED will shine for up to 10 minutesl Stylish profile ... 200pcs/ctnSize22.5x18x16cmNW5kgGW5kgFeatures1.Dynamo for a minute,can support LED lighting for 8-10 minutes. 2.Dynamo for 30 ... minutes to full charge ,discharge time is 2 hours. mini 2 LED dynamo keychain