Usongs Acoustic Pickup for Violin Viola Cello Bass / Plugs Into Amp or Pa Set up Via 1 / 4 Plug New and high quality. Reproduces natual sounds & overtones Plugs into amp or pa set up via 1/4 plug No batteries needed Clips into "F" hole. A quick and easy way to amplify your violin sound Come with 1 usongs brand USB all in one card reader, 1 random color usongs keychain retractable measuring tape. and with 1 usongs Cardboard Box in packing