Specifications: External sensor:- Battery: built-in 140mAh button cell- Waterproof grade: IP67- Working temperature: -30 - 80 Deg.C- Storage temperature: -30 - 85 Deg.CTPMS:- Battery: built-in 345mAh Li-ion battery- Operating voltage: 3V- Working frequency: 2.4GHz- Response time: 6s- Working humidity: 95 percent and le- Preure monitoring range: 100 - 900 kPa- Preure accuracy: minus or plus 10 kPa Descriptions: Many motorcycle accidents are caused by the flat tire on the road. As a motorcycle owner, the safety of driving is the first thing. To reduce such accidents, the installation of tire preure monitoring system (TPMS) is neceary. With the TPMS, we can keep the tire working within the specified preure and temperature range at any time to reduce the damage of the tire for safe driving.Main features:- Powerful TPMS:TPMS can monitor tire preure / temperature status in real time, which will transmit real-time voice alarm and warning indicator light to remind the driver for driving safety.- Wide compatibility:This system is widely compatible with those motorcycles with 2 tires. You don't have to worry about the compatibility iue.- Power supply:Supports USB charging, which means that you could use the USB cable (not included) to charge it up while it is in low power, rather convenient.- 2 external sensors:Its 2 external sensors with IP67 waterproof grade are suitable for being used on rainy days. Besides, they are in high sensitivity and good accuracy for measuring preure and temperature.