Item Type: Ukulele Pickup Material: Plastic Interface: 6.35mm interface (MP20 model) 3.5mm interface (MP50 model) MP20 Size: Approx. 30 x 30mm / 1.2 x 1.2in MP50 Size: Approx. 45 x 30mm / 1.8 x 1.2in Package List 1 x Pickup 1 x Hook and Loop Fastener 1 x Adhesive Stickers 1 x English User Manual 1MP20 pickups use international standard 6.5mm jacks, MP50 pickups use international standard 6.5mm plugs and 3.5mm plugs 2Suitable for a variety of musical instruments, including folk acoustic guitar, classical acoustic guitar, ukulele, mandolin, etc. musical instruments with resonance box 3With batteryfree design, no battery installation is required, which brings you more convenience 4The sound pickup effect is sensitive, which can effectively convert the vibration signal from the piano body into an electric signal, which functions as a microphone and brings you better music enjoyment 5Small and convenient, can be carried with you, very suitable for personal performance and performance use 6Convenient to use, no need to punch, just stick the edge of the sound hole of the acoustic instrument to start playing to protect the body. The MP20 model has a fixed hole with a 6.5mm interface, which can be hung on by using hook and loop fastener on the body 7The MP20 model is equipped with a converter, and the MP50 model also has an independent knob to adjust the volume. You can choose between two pickups according to your personal needs.