Wood grain design, a wireless guitar system with Flanger and Tremolo functions. - Model: Syonike TX/RX - Function: Wireless system - Color: Wood grain - Connection type: 1/4 inch jack - Adjustment functions: Flanger, Tremolo, Clean, Metal This product connects an electric guitar and an amplifier via Bluetooth. Simply plug the receiver into the amplifier and the transmitter into the guitar or bass jack. Super easy wireless! Operation has been confirmed with an electric guitar. Used once indoors after purchase. The photos show the Syonike TX, a portable guitar effect/synthesizer. This is a wireless transmitter that plugs directly into the guitar. It features five effect modes: "Clean", "Bluesy", "Tremolo", "Flanger", and "Metal". It has a built-in rechargeable battery and an indicator to show the battery level. Includes a cable that allows charging of two units simultaneously via a USB port. Thank you.