This is a fail safe way to make sure your dog is secure when wearing their prong collar. The short clip attaches to the prong collar while the long clip attaches to your dog's collar. 
 
You will simply pick two colors from the picture and it will look like the example provided.
 
1. Black/White/Grey, 2. Pink/White, 3. Blue/Black, 4. Chocolate Brown, 5. Plum Purple, 6. Camo, 7. Light Grey, 8. Teal, 9. Light Turquoise, 10. Blue, 11. Dull Brown, 12. Light Blue/White/Black, 13. Grape Purple, 14. Navy, 15. Yellow, 16. Yellow/Green/Teal/Black, 17. Blue/Grey/White/Black Camo, 18. Light Pink, 19. Black, 20. Red, 21. Hunter Green, 22. Mud Grey, 23. Chestnut Brown, 24. Neon Pink, 25. Pastel blue, 26. Orange/White/Brown, 27. Burnt Orange, 28. Army Tan, 29. Grey Camo, 30. Maroon, 31. Red/White/Blue, 32. Electric Blue, 33. Rainbow Camo, 34. Blue/ Light Blue/White, 35. White, 36. Neon Orange, 37. Orange/Red/Yellow/Maroon 38. Grey/Burnt Orange, 39. Red/White, 40. Green, 41. Green/White, 42. Bright Green, 43. Grey/Black/White, 44. Shade of Green, 45. Yellow, 46. Shades of Blue, 47. Blue/Grey/Bright Yellow-green, 48. Pink/Purple, 49. Green,Black, 50. Pale Purple, 51. Shades of Purple, 52. Red/White/Tan, 53. Blue/Green/Grey, 54. Shades of Green, 55. Camo, 56. Blue/White, 57. Aqua, 58. Teal, 59. Pink/Purple, 60. Shades of Pink, 61. Neon Orange, 62. Shades of Red, 63. White/Grey