Professional pickup--a pickup with 1/4 inch jack, 30m cable and volume control, eliminates almost all external sound interference, captures clear and accurate sound No battery driven--it converts vibration signal into electronic signal output directly, works great even without battery Easy to install--comes with double-sided tape, it can be attached on the panel near the sound hole with ease, with no hurt to the instrument Pocket size--featured with portable, lightweight and easy-to-use, it is easy to carry anywhere; just plug it into amp or other recording equipment when in use Multiple usage--the pick up is suitable for acoustic guitar, violin, mandolin, pipa, cello, kalimba, ukulele, etc