3-in-1 Bicycle Speedometer Wireless USB Rechargeable Double T6 LED Bike Light Bike Computer with Alarm Horn

Specifications: 
Name: Bicycle computer horn lamp; 
Model: BK - 1920; 
Lamp bead: 2 * T6; 
Headlamp brightness: 800 lumens; 
Lighting mode: First gear: 100% brightness of 1 LED; Second gear: 100% brightness of 2 leds, if it does not move after 3 minutes, it will become 60% brightness; Third stage: 2 LED brightness 60%; Fourth gear: 2 LED flash units. 
Effective range: 200m; 
Electronic speaker:Approx. 120dB; 
Headlight working time: 6HRS / 12HRS; 
(Headlights off, odometer only working) Working time:3000HRS; 
Rechargeable battery: 4000mAh; 
Charging mode: USB charging; 
Charging time: 4 hours; 
Sensor battery: CR2032; 
Waterproof rating: IP65; 
Weight: About 145G