USB TPMS Tire Pressure Monitoring System for Car Navigation Radio DVD Player - External Sensor for Spare Tyre Alarm Monitor: TPMS simultaneously show 4 tires' pressure or temperature.TPMS automatic update the tire's pressure and temperature, keep your driving safe.Tire Pressure Monitoring system be warning when the tire temperature is high, pressure is low.Slow and fast air leakage alarm when tire piercing. High voltage alarm value: 3.1 Bar Low voltage alarm value:Less than 1.8 Bar High temperature alarm value: 75 Default air pressure unit: Bar Technical parameters of sensors: 1. Working voltage:2.1-3.6V 2. Pressure measurement range:0-8Bar 3. Temperature measurement range:-40-125 4. Sensor weight:external less than equal 10 grams,internal Less than 34g 5. RF operating frequency:433.92MHz Receiver Technical Parameters: 1. Working voltage:DC12V 2. Maximum operating current:less than 15mA 3. High frequency operating frequency:433.92MHz 4. Working temperature:-40-85 5. Communication line length:20CM Name:TPMS Spare Tyre External Sensor Voltage:5V Special Features:USB TPMS Item Weight:0.16kg Model Name:Tire Pressure Monitoring System For Android Player Item Type:Alarm Systems&Security External Sensor: Easy to install,convenient to replace Dust-Proof/Water-Proof/Anti-theft Anti High Temperate and Cold IP67 Protection/Waterproof Working Temperature:-20-85 Sensor Battery:button battery Battery Life:2 Years,replaceable Carrying method:Portable Applicable model: Display mode:digital Appearance:Mini type Specifications:USB external Tire pressure gauge Type:Pressure monitoring system Tire pressure gauge Accuracy Type:High precision Colour:Black Material:Plastic Package Contents: 1 * receiver 4 * external sensors(button battery) 1 * usb cable 1 * wrench 4 * nuts Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.