Kirinavi USB Car TPMS Tire Preure Monitoring with 4 Internal External Sensors for Android car radio Auto Security Alarm System Specification: Type: Solar Wirele Car Tire Preure Alarm Monitor System TPMS Working Frequency: 433.92MHz 50KHz Sensor Working Preure: 0-99Psi 1.5 Psi , 0-5bar.Note: For car only) Sensor Transmit Frequency: 433.92MHz Sensor IP: IP67 Working Voltage: Sensor: 2.1-3.6V; Receiver: DC 3.7-5V Receiver Working Temp.: -2 ~ 75 C / 28~167 F Receiver Storage Temp.: -3~80 C / 26~176 F Sensor Working Temp.: -40~90 C / -40~194 F Sensor Storage Temp.: -40~100 C / -40-212 F Receiver Battery: Built-in 480mAh battery Receiver Charge Time: About 1h by DC 5V 1A Sensor Battery: Included Certification: CE, FCC Package(Internal): 1 x Solar powered monitorreceiver 4 x Internal / External sensor