Usongs Contact Microphone Mic Pickup for Guitar / Violin / Banjo / Viola Professional Accessory New and high quality. Contact microphones pick up sound by being in direct contact with the sound source They have the advantage of being able to eliminate interfering external sounds and not be influenced by sound reflections from nearby objects Just plug it into your amp, bass amp or other recording equipment. Self adhesive and Velcro, and a clip included This unit works with a standard 1 / 4" (6.3mm) jack plug. You can amplify your guitar, mandolin, banjo, violin, ukulele, viola, cello, and just about anything else Come with 1 usongs brand random color giraffe style ballpoint pen, 1 random color usongs brand keychain style retractable measuring tape. and using a Cardboard Box in packing for good protecting the product