The black and white CA-X from Teenage Engineering is a silicone pro case specifically designed for the Pocket Operator PO-32 Tonic drum synthesizer and sequencer with a user-customizable sound set. The CA-X features numbers instead of symbols, which allows the case to be used with any pocket operator. The case not only offers protection to the circuit board but also provides antislip feet, battery protection, and professional-feel buttons. The case includes a matching lanyard.