I want to create a Bluetooth speaker where the LED color intensity changes according to the volume level. What components do I need to use?
What changes. Intensity(aka brightness)? or Color? Or both?
Volume level
Irregardless of frequency, or skewed so that bass intensity pulses the LED, treble is irrelevant? These are important clarifications.
That's the hard part. 
I've never done it, but you'll need a Bluetooth audio receiver and I don't think an Arduino will be helpful with that part.
Something similar to get you started - World's Simplest Lighting Effect.
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both brightness and Color
Two issues, receiving Bluetooth audio and displaying sound as color. The Bluetooth receiver is a module. Easy-peasy.
The conversion of audio into lights has two parts, seperation by frequency (red low, blue high, green mid) and then amplitude within that frequency. Having worked all that out you can then drive three PWM outputs (r/g/b) to control your led's.
Lots of hardware decisions needed, most importantly, what LED's are you driving? One little T1-3/4 four lead R/G/B? A 10' string of high intensity R/G/B's? It makes a difference.
An easy way to get an active bluetooth speaker is buy a cheap ($25usd) car stereo and use that as the audio chain. Then you can tap the preamp output as the input to the filter and led drive Arduino.
humm Can this module be controlled through Arduino? https://smartstore.naver.com/ic11401/products/2076086693?
Dunno, can't read Korean.
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