Product Name: Keychain Digital Tire Pressure Gauge with LED Light (OO-002) Transport Package: Blister Card Specification: RoHS Origin: China Product Description Bright white LED flashlightRed or Blue backlightAccurate readings from 5 to 100PSI, Accuracy: +/-1PSI; Pressure measurement displayed on easy-to-read LCD displayOperating temperature range: 0 to 50 deg. C (32 to 122 deg. F); Battery included: 2PCS CR1632 ( 6V ); Screw the back cover to change new batteries. Instructions: Press the button to activate the device, the LCD screen display 188. 8PSI and then change to 0. 0psi immediately Push it onto the tire's nozzle until no hissing sound escapes Then hold it on the valve stem until a reading appears on the LCD display Long press to shut immediately and it will be off automatically after 30 seconds no use Press restart, repeat use When the screen displays battery icon, batteries should be replaced