Item Type: Headphone Guitar Amplifier Material: ABS+electronics Color: White Product Size: Approx. 9.4 x 4.6cm / 3.7 x 1.8in Power Supply: 2 1.5V AAA alkaline batteries (delivered without batteries) Battery Capacity: 800mAh Instrument Interface: Approx. 6.35mm / 0.3in mono jack Maximum Input Level of Instrument: -10dB Instrument Input Impedance: 1M Ω Headphone Jack: Approx. 3.5mm / 0.14in stereo jack LINK Interface: Approx. 3.55mm / 0.14in 4-pole socket LINK Output Impedance: 10K LINK Input Impedance: 100K 1、I-PLUG comes with a distortion effector, the sound quality is beautiful, small and exquisite, and full of functions. 2、The product can connect headphones and guitar at the same time, silent practice will not disturb other people, user can also enjoy carnival. 3、The amplifier also supports the connection of for iOS/android/windows phone series of smart devices. 4、User only need to add favorite software in phone use the I?PLUG as a small sound card, which is easy to choose effector, instrument speaker, microphone and other equipment for simple recording. 5、The I-PLUG effector does not need speakers, and does not need to be connected to cumbersome things. User need to connect an I-PLUG earphone to work. 6、I?PLUG is a headphone guitar speaker with a built?in warm tube overload effect, which is mainly combined with headphones for practice, eliminating the trouble of connecting effects, cables, speakers, etc., and practicing piano no longer disturb the people. 1 x Speaker 2 x Link Line 1 x User Manual