Feature 1Intelligent accuracy: real time monitoring of four tire pressure, tire temperature, precisions and efficiency, can timely grasp the tire situation, reduce the incidence of accidents, and enhance driving safety. 2Two kinds of sensors are available: users can choose the built-in sensors set or the external sensors set according to their needs. 3Clock and power display: with clock display, it can display time, power and other information at the same times to remind users to charges in time. 4Wireless transmit: data wireless transmit, intelligent and efficient, real time update. 5Solar powered design: energy saving and efficient, in the process of driving can also charges, long lifes, but also can use USB chargings cable. 6360 rotatable: the tire pressure monitor can rotate 360 and adjust 45 up and down, fixed at an appropriate angle and field of views. This tire pressure monitor can display the four tire pressure in real-time, help users monitor the tire condition in-time, enhance riding safety, and has the function of clock, which is suitable for a variety of models. Specifications: Material: aluminum alloy + copper + plastics Type: External sensors set Receiver: Battery: built in 3.7V, 400mAh battery Working voltage: Direct Current 5V Transmission frequency: 433.92MHz Pressure unit: psi / bar Temperature unit: Deg.C / Deg.F. Working temperature: -20 ~ 85 Storage temperature: -30 ~ 85 External sensors: Working pressure: 0 ~ 51 psi / 0 ~ 3.5 bar Pressure accuracy: 0.1bar Working frequency: 433.92MHz Working voltage: 2.1 ~ 3.6V Water Resistant: IP67 Working temperature: -40 ~ 85 Storage temperature: -30 ~ 125 Battery: built in CR1632 120mAh battery Battery life: about 1~2 years (replaceable battery) Item weight: Internal sensors set: 270g / 9.5ounce External sensors set: 170g / 6.0ounce Package size: 160 * 140 * 58mm / 6.3 * 5.5 * 2.3in Package weight: Internal sensors set: 320g / 11.3ounce External sensors set: 220g / 7.8ounce Package List 1 * Receiver 4 * External Sensors 4 * Screw 1 * Spanner 1 * USB Cable 1 * User Manual