Features: brand new and high quality High-density installation: Space-saving design, with the smallest connector width, but still reserves enough area for easy pick-and-place installation. A variety of stacking heights can be selected: In addition to the space-saving design, a variety of stacking heights are also available, which can add versatility to any application. Stack height: 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm and 4.0mm. High contact reliability: Despite its short stature and low profile, these contacts can provide strong contact force and an effective mating length of 0.45 mm at a stack height of 1.5 mm. This connector uses a locking system to prevent accidental disconnection problems and emit a clear tactile click to ensure that the mating has been completed. Reinforced structure, equipped with damping device: damping ribs are added on both sides of the connector. Avoid solder wicking: A nickel-plated barrier is added to protect the contact area from potential solder wicking. Anti-pollution design: When paired, the design of the connector covers the contacts, helping to prevent dust and other debris from entering the contacts. The SMT leads are kept very close to the connector housing, which also helps prevent debris on the exposed contacts from causing a short circuit. High-speed signal, with anti-noise function: shielded type can support high-speed signal transmission and prevent noise. Minimum width: 3.38mm. Specifications: Color: black Type: DF40HC(3.0)-100DS-0.4V, DF40C-100DS-0.4V (optional) Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1PC x for Raspberry Pi CM4 Socket