Description:5 sound effects modes, it is easy to use and can meet your different needs.Headphone output and bluetooth-compatible receiving function, the guitar headphone amp is very convenient to use.Made of high quality plastic material, it is harmless, environmentally friendly and durable.The open length of the electric guitar amplifier is 123mm, width is 43mm, height is 20mm.It is suitable for musical instruments, electric guitar, bakelite guitar with pickup, etc.Item Name: Guitar Headphone AmpMaterial:ABSBatteries: Built-in Rechargeable 800mAh Battery(Included)Charging Time: 1.5-2.5 HoursStandby Time: >8 HoursSize Details:Open Size: 123mm x 43mm x 20mm/4.84" x 1.69" x 0.79" (Approx.)Folded Size: 76mm x 43mm x 40mm/2.99" x 1.69" x 1.57" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 X Guitar Headphone Amp1 X USB Charging Line1 X D3.5 to D6.35mm Audio Line1 X Cloth Bag1 X User Manual