Size and materials Dimensions: 9.8 x 7 x 1.6 cm (3.8 x 2.7 x 0.6 in) Color: as shown in product images Construction: ABS and metal Why this mini theremin module matters Instant playability: builtin speaker lets you start playing right away. The speaker mutes automatically when headphones are plugged in for quiet practice. Easy power and connectivity: powered by USB Type C for simple, modern charging and use with common chargers and power banks. for learners: pitch indicator and a corresponding piano display help beginners see pitch and finger placement, speeding up learning and improving accuracy. Rich sound palette: over 70 selectable sound options, including more than 20 traditional Chinese instrument timbres, so you can explore a wide range of sonic styles without extra gear. Clear visual feedback: bright color display shows waveforms, time, and volume levels so you can monitor performance and settings at a glance. Portable and comfortable: compact, lightweight design with a detachable antenna for easy storage and comfortable playing on the go. Key features at a glance Builtin speaker and headphone output with automatic speaker mute when headphones are connected USB Type C power input for convenient charging and use Color display that visualizes waveform, time, and volume Pitch indicator plus piano display for learning and practice More than 70 sound options including over 20 traditional Chinese instruments Detachable antenna for portability and ergonomic play Durable ABS and metal construction Typical uses Practice and learning: visual pitch and piano reference make this ideal for students and beginners working on pitch control and tone. Live performance and busking: compact form and builtin speaker let you perform without hauling extra amplifiers. Sound design and home studio: wide sound library provides varied timbres for composition and electronic music projects. What is included 1 pc Audio Theremin Musical Module Notes and precautions Product color may vary slightly from the images due to different screen displays. Check the listed dimensions before ordering if size is a concern.