These LED rings are stand-alone units which require no separate controller and feature 10 different lighting modes selectable by an on-board switch. These are the perfect night flying accessory for your multi-rotor aircraft or just about any other R/C model!Features:?Simple and easy installation?No separate controller required?10 lighting modes selectable by on-board switch?3.3~5.5V input voltage rangeSpecs:Power Supply: 3.3~5.5VDCConsumption Current: 30mA ON / 2mA OFFON/OFF Control: PWM 760uSColor: RedSize: 145mm diameterWeight: 15g