Core: ARM M0 Working voltage: 3V Working current: 300μA Sleep current: ≤ 2.2μA Bluetooth operating frequency: 2.4GHz Bluetooth transmit power: 0dBm MAX Response time: ≤ 5s Display mode: APP mode Waterproof rating: IP67 Working humidity: 95% MAX Tire pressure detection range: 100-1300kPa Tire pressure detection accuracy: ± 10kPa Tire temperature detection accuracy: ± 3 Tire Pressure Smart Tire Pressure Product Specification Working temperature: -30 ~ +80 (external type) Working temperature: -40 ~ +85 (built-in) Storage temperature: -30 ~ +85 (external type) Storage temperature: -45 ~ +125 (built-in) Battery capacity: 140mAh (external type) Battery capacity: 330mAh (built-in) Battery life: about 400 days (external type, 4 hours driving per day) Battery life: about 1200 days (built-in) Weight: 8g±1g (external type) Weight: 30g±1g (external type) APP program features: Quick-leak alarm: When the air pressure exceeds 5Kpa within 5 seconds, the quick-leak alarm will be activated, and the "leak" icon will appear; Slow leak alarm: When the air pressure value is lower than the set air pressure lower limit, the system starts the slow leak alarm, and the "low air pressure" icon appears; High pressure alarm: when the air pressure exceeds the upper limit of the tire pressure, the "high pressure" alarm will be activated; Low pressure alarm: when the air pressure is lower than the lower limit of the tire pressure, the "low air pressure" alarm will be activated; High temperature alarm: when the temperature inside the tire exceeds the upper limit of the tire temperature, the "high temperature" alarm will be activated; No signal alarm: if no signal is received within a certain period of time, "no signal" alarm will be activated; Low battery alarm: When the battery voltage is lower than the set value, start the "low battery" alarm;