20 x Auto self Flash LEDs 3mm Blue without extra circuit /Frequency 1 second

Buy It Now Price is for 20 pcsFlash Automatically Every one Second3mm Blue LEDsSuitable to simulate emergency vehicle, police wagon, ambulance, fire engine and other alarm system.      Characteristic U = 3VI = 15 - 20mAPrice is for 20 units3mm O/D Solder connections, Cathode 16mm Anode 17mm Long.Brand newPRODUCT  DESCRIPTION Use these LEDs to make alarm system or singals etc...the LEDs may flash automatically every one second when connect to power source....