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Colour calibration: If the colour of the app does not match the colour of the LED strip, you can use the app to calibrate the colour so that it is consistent. Simply choose the right colour when calibrating CERTIFIED QUALITY AND SAFETY SP621E controller certified by FCC, CE, RoHS, adopt the top materials and processes of industry, flame retardant shell resistant to high temperature of 750°C, high quality components Music Control & Timer Function Convert your phone microphone or music player into a wonderful light signal while the lights can be turned on/off by timing App control with multiple options: support IOS/Android app control. Simply choose 18 music modes and 142 light effects by Bluetooth connection. Brightness and colour adjustable, so you can choose your favourite colour at any time Wide Compatibility The SP621E controller supports 5V WS2812B and 12V/24V WS2811 LED strip or strings. Can be controlled by smartphone, can easily change the colour and adjust brightness or mode, download by scanning the QR code Multi-device control: supports grouping and simultaneous control of multiple devices, automatic device connection and automatic reconnection when opening the app for maximum ease of use Wide voltage range: USB 5-24V wide voltage input with anti-return function of power supply, can drive up to 600 pixels and is compatible with common single line LED driver ICs on the market