Volume Up, Volume Down/2. Counterclockwise leftmost: reverb, 2. Clockwise center: chorus, 3. Press the potentiometer: turn on the Bluetooth function (YX-MUSIC). Indicator light (red light on when need to charge / blue light on when connecting Bluetooth). Pre-wired kit: the guard comes with the necessary electronics pre-installed and already connected, simplifying the installation process. Humbucking Pickups: The kit includes humbucking pickups, which typically offer higher output and different tonal characteristics than the single-coil pickups commonly found in Stratocaster guitars. Built-in effects: The guard has a variety of effects built in to enhance the versatility of the guitar. 3.1 Timing effects (time-based effects). Reverb: Simulates sound reflections in different environments, adding depth and dimension to the tone. Delay effect (Delay): delays the input signal for a period of time after the output to produce an echo effect, adding a sense of space and richness to the tone. 3.2 Modulation Effects. Chorus effect (Chorus): Mixes the original signal with a slightly delayed copy to create a rich, expansive tone. Phase effect (Phaser): Changes the phase of the input signal to create a flowing tone. Tremolo effect (Tremolo): rapidly changes the volume to create a tremolo effect. Distortion (Distortion): Increase the distortion or compression of the audio signal to produce the characteristic tones of rock, metal and other music styles. Overdrive: “overloads” the signal before it is boosted, increasing volume and distortion to create a warm orchestral sound. Fuzz: Adds extremely rich distortion to create heavy, harsh tones.