Come and see our amazing products. High quality transparent acrylic panel. The oxygen meter body is elaborately made of ABS material, very exquisite and compact. Large LED and backlight display make it very easy to read. Using the most advanced MCU chip and sensor, blood oxygen signal is collected by photoelectric sensing principle. Suitable for sports enthusiasts and aviation use only, accommodates wide range of finger sizes - children to adult. Complies with FDA, Prop 65. 2.36" L x 1.38" W x 1.18" H The price includes the shipping cost to CA,QTY over 5000pcs by ocean. Pls confirm further with us if any query about packing info, inventory status and time schedule.