1. No need to change the line, just follow the wire on the wheel.

2. One wheel can be more than one card, the combination of blue and red is more cool and cool.

【Specifications】:

【4 modes】: Long Bright, slow flash, explosion flash and strobe.

【Material】: PC + ABS

【Bulb Type】: LED

【Lights Color】: Red

【Brightness】: 15 lumens

【Mounting Placement】: Bicycle Seat Post

【Suitable Tube Diameter:12-32mm

【Packing Included】:

1Pc Bicycle Light

【Notes】:

1.The product comes with a battery, you can use it when you get it, one 2032 battery per product

2.Due to the difference between different monitors, the pictures may not reflect the actual color of the item.