Black: external sensor black Silver: External sensor Silver internal Gray: Internal sensor gray Product Features: 1.Universal suitable for almost of all two-wheeled motorcycles,easy to install.self-matching, simple to operate, convenient to use 2. Powered by USB cable,2 external or Internal sensor 3. Built-in high temperature resistant explosion-proof lithium battery,fast charging, long lasting power 4. Real-time display of highly accurate tire temperature and pressure data of 2 wheels at the same time 5. Quickly detect leak and alarm, extend tire life, balance tire pressure, ensure the safety of motorcycles 6.PSI, BAR two kinds of pressure unit optional, and two kinds of temperature unit optional 7. Each sensor has a separate ID code, which has been completed before delivery, can be directly used after installation 8. TPMS dedicated radio frequency technology, the sensor real-time updates data, alarm when tire pressure and temperature are abnormal 9. TPMS dedicated Freescale chip program, 6-in-1, makes the signal more stable and reliable, monitoring data more accurate to ensure traffic safety 10.You can purchase the same type of battery for replacement after the battery run out, without having to