Check out the holes at one side. 

? Insert the needle into the hole. 

? Press the middle part like the picture shown, until the little hook protrude. 

? Hitch the sewing thread on the hook. 

? Un-press the middle part. 

? Pull out the needle, and the sewing thread ran through

? Specification:

? Material: Plastic 

? Color: send in random 

? Size:Appr 7x2.2cm/2.76"x0.87" 

? Package Included: 1 X Automatic Needle Threader