![](https://s3images.coroflot.com/user_files/individual_files/386159_u5jckbvaiadc_23zbmofka8rr.jpg)
![](https://s3images.coroflot.com/user_files/individual_files/386159_kb0w7vzmpv035260r5ljhvbb4.jpg)
![](https://s3images.coroflot.com/user_files/individual_files/386159_fa8ew5uswdlqad6egylv65_bs.jpg)
![](https://s3images.coroflot.com/user_files/individual_files/386159_gwpmk8qwund_mbip5vha8orqi.jpg)
When walking dog, the dog always runs around and pulls the dog chain.
![](https://s3images.coroflot.com/user_files/individual_files/386159_wvz_cqqto6u9cz8qriigf02bq.jpg)
The mechanical spring repeats contraction and elongation, the same time it transforms the mechanical energy into electrical energy which can be stored.
![](https://s3images.coroflot.com/user_files/individual_files/386159_ye74e8y0mlra0s9rjkgaehefa.jpg)
When at night or in the dark, just press the switch and turn on the LED light.
![](https://s3images.coroflot.com/user_files/individual_files/386159_sgicfsacpm33fcm5oasilh8zn.jpg)
Then you will get brighter and more confortable environment and enjoy a new experience while walking dog.
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