Product choice:Black: external sensor blackSilver: External sensor SilverGray: Internalsensor gray Product Features:1. Powered by USB cable,2 external sensor2. Built-in high temperature resistant explosion-proof lithium battery,fast charging, long lasting power3. Real-time display of highly accurate tire temperature and preure data of 2 wheels at the same time4. Quickly detect leak and alarm, extend tire life, balance tire preure, ensure the safety of motorcycles5.PSI, BAR two kinds of preure unit optional, and two kinds of temperature unit optional6. Each sensor has a separate ID code, which has been completed before delivery, can be directly used after installation7. TPMS dedicated radio frequency technology, the sensor real-time updates data, alarm when tire preure and temperature are abnormal8. TPMS dedicated Freescale chip program, 6-in-1, makes the signal more stable and reliable, monitoring data more accurate to ensure traffic safetyDisplay parameters:Size: about 48 * 48 * 27MM/1.89 * 1.89 * 1.06inWeight: about 50GBuilt-in lithium battery capacity: 850 mAhWorking temperature: (- 20 ~ +80 )Storage temperature: (- 30 ~ + 85 )Receiving frequency: 433.92MHzSensor parameters:Working temperature: (- 40 ~ + 105 )Storage temperature: (- 40 ~ + 120 )Preure range: 0 ~ 116psi (0 ~ 8bar)Preure accuracy: 0.15PSI ( 0.01bar)Temperature accuracy: 3 Transmiion frequency: 433.92MHzBattery life: about 2 yearsSize(approx.): Height: 13mm/0.51in, Diameter: 18mm/0.71inWeight: about 6.0g