Logitech TrackMan Marble wired optical trackball mouse base unit in metallic dark silver/gray with black base (Model: T-BC21; P/N: 804360-0000; M/N: T-BC21). Features Logitech's patented Marble optical sensor technology, amofferextrous curved ergonomic profile suitable for left- or right-handed operation, 4 programmable buttons, and an integrated USB-A connection cable. Ideal replacement base unit for users who already own the red marble trackball sphere. Trackball mouse base unit only. Pre-owned condition (tested and working; clicks register crisply; USB cable is supple with intact strain relief; sensor cradle is clean; note: red trackball sphere is NOT included).Key Features & Specs
• Brand: Logitech (Genuine OEM)
• Model / Series: TrackMan Marble Mouse USB
• Model / MPN: T-BC21 (P/N: 804360-0000)
• Connectivity: Wired USB-A
• Tracking Technology: Logitech Marble Optical Sensing
• Number of Buttons: 4 (Left, Right, and dual small programmable inner buttons)
• Design / Ergonomics: Symmetrical Amofferextrous (Left or Right-Handed use)
• Color: Metallic Gunmetal Silver / Gray with Black Base
• Country of Origin: China (per bottom casing label)Measurements & Weight (Approximate)
• Dimensions: approx. 6.5 in x 3.5 in x 1.75 in (approx. 16.5 cm x 8.9 cm x 4.5 cm)
• Cable Length: approx. 6 ft (approx. 1.8 m)
• Base Unit Weight: approx. 5.5–6.5 oz (approx. 155–185 g)What's Included
• 1x Logitech TrackMan Marble Mouse USB Base Unit Only (Model T-BC21)
(Note: Red trackball sphere, driver disc, and original retail packaging are NOT included)Condition & Inspection Notes
• Pre-owned condition in solid functional working order.
• Missing Part Note: Red marble trackball sphere is NOT included (cradle base unit only).
• Tested & Working: Connects immediately via USB; all 4 micro-switches click cleanly with firm response; optical sensor chamber is clean and reads motion properly when a compatible ball is seated.
• Cable & Connector: USB cord is flexible with no exposed wiring, kinks, fraying, or loose strain reliefs.
• Cosmetics: Silver casing displays light, normal cosmetic surface scuffs and minor desk contact rubbing from prior use as shown in photos.
• Has been wiped down, cleaned, and stored in a clean, smoke-free environment.SKU: GF
