Specifications: Longt: 9CM   Weight :22g Product name:Smart key chain Color:black/blue/red/grey Process: stamping + anodic oxidation. Material: A aluminum alloy is sandblasted and oxidized. Description: 1. Compact design: Smaller than a pack of balls. Put it in your pocket 2. Smart leader: Allows you to organize several units together. 3. No noise: the keys no longer wobbles, avoiding metal noises. Note:  1. Please allow measurement deviation due to manual measurement. 2. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Package Included: 1 x Smart key chain.