A portable pump with a taillight integrated portable pump with a special Presta base that can be refilled up to 160 psi aluminum alloy thumb lock mechanism, polycarbonate, cylinder, clamping to attach to the seat stays and seat posts (YPP16500), Mounting diameter: Φ0.6 - 1.0 inches (15 - 25.4 mm) x 2, Φ2 - 1.9 mm 0.5W Red 2 LED lighting / flashing modes: 50 hours, flashing: 100 hours. Includes 2 coin shaped lithium batteries (CR2032) L173 x W30 x H24 mm 67 g; Product color may appear different from the actual product depending on your display type. Product specifications, logo design, etc. may be subject to change for product improvement. We also cannot answer measurements or personal fit that the manufacturer does not announce.