Topeak D2 SmartGauge Used by both professional and amateur riders alike Made using high quality materials and components Tested to ensure quality and durability Head Smart Head/Gauge Digital - PSI, Bar, kg/cm2 Battery CR2032 x 1 (included) Capacity Reads 250 psi/17 bar Size (L x W x H) 10.2 x 4.5 x 3.5 cm/4" x 1.8" x 1.4" Weight 65 g/2.29 oz.