【Product Overview】 The SKYSONIC R2 Resonance Pickup is a high-quality pickup designed for acoustic guitars. It features a variety of control functions to enhance sound quality. 【Features】 - Volume, delay, reverb, ford, power, and phase control knobs allow for fine-tuning of the tone. - Easy connection using a 3.5mm jack, compatible with various devices. 【Included Items】 - User manual, USB cable, connection cable, and control knobs are included, allowing for immediate use. - Brand: SKYSONIC - Model Name: R2 - Type: Resonance Pickup - Included Items: User manual, USB cable, connection cable, control knobs - Control Knobs: Volume, Delay, Reverb, Ford, Power, Phase - Connection Terminal: 3.5mm jack - Country of Manufacture: China Thank you for viewing. I had this installed on my guitar until recently. There are no issues with its use. When you install this on an acoustic guitar, it produces a sound similar to being connected to an amplifier, even without being plugged in. Please check YouTube for demonstrations. The speaker is attached inside the acoustic guitar, but the original double-sided tape has been removed, so it is not attached. Please purchase commercially available double-sided tape and apply it yourself.