Solar TPMS Car Tire Pressure Alarm Monitor System Display Temperature Warning Fuel Save with 4 Sensors Features: Real time Monitor tire pressure can improve fuel efficiency, prolong tire life, increase traffic safety and monitor temperature. LCD displays tire pressure andtemperature Visual and sound warning Air leakage warning, low pressure warning, high pressure warning High temperature warning, low power warning and no signal warning Solar power for normal use. Available USB charge for sunless day Difference between External and Internal sensor TPMS: External:Battery life 2 years, external screw lock. Easy DIY installation done in 10 minutes. Internal:Battery 5 years,Internal lock. Needto install at Car ServiceShop. External sensor Specification: Type: Solar Wireless Car Tire Pressure Alarm Monitor System TPMS Working Frequency: 433.92MHz 50KHz Sensor Working Pressure: 0-60Psi 2 Psi 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 400mAh battery Receiver Charge Time: About 1h by DC 5V 1A Sensor Battery: Each sensor is powered by 1 x CR1632 lithium-ion battery (included) Certification: CE, FCC Sensor Size: 2.3 x 1.7cm / 0.8 x 0.7"(D x H) Display Size: 9.5 x 8 x 2.7cm / 3.7 x 3.1 x 1.1"(L x W x H) Net Weight: 0.14kg / 4.9oz Internal sensor Specification: Type: Solar Wireless Car Tire Pressure Alarm Monitor System TPMS Working Frequency: 433.92MHz 50KHz Sensor Working Pressure: 0-60Psi 2 PsiNote: 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 400mAh battery Receiver Charge Time: About 1h by DC 5V 1A Sensor Battery: Included Certification: CE, FCC Sensor Size: 56 x 80 x 14mm Display Size: 95 x 80 x 27mm Net Weight: 0.14kg / 4.9oz