bike lamps ,printed with custom logo,attached with rubber string

Size: 4cm*2.4cm*0.8cm,

High-intensity LED light  :13000-15000mcd,

button cell battery :2*CR2016*3V

Switch : pull on/off

^{_{with  3 functions:
1.   flashing quickly,
2.   flashing slowly,
3.    just keep bright.}}