Brand: ELECOM Color: Black Connectivity Technology: USB, 2.4GHz Wireless Features: Silent Buttons Movement Detection Technology: Optical About this product: The "bitra" wireless mobile trackball, designed for index finger operation, achieves high operability despite its compact design, perfect for mobile use. [Connection Method] 2.4GHz Wireless (Receiver included) [Number of Buttons] 5 buttons *including wheel button [Size] S size: Width 61.9mm x Depth 93.9mm x Height 40.2mm [Power Supply] One AAA alkaline dry cell, AAA manganese dry cell, or AAA nickel-hydrogen battery (Estimated battery life: approximately 110 days) 4549550124775 *Note: Although new and unopened, the outer packaging may have sun damage, scratches, stains, crushed boxes, discoloration, barcode stickers, etc. Therefore, it is offered at a bargain price. The degree varies, but please purchase only if you understand this. Due to home storage, no returns or claims are accepted.