ITEM NAME:Mini Magnetic Reed Module Board for Starters Compatible KY-021 for Arduino #gib Store Home Promotion Hot Item Add to Fav.Import often open Reed switch. 1 x Mini Magnetic Reed Module. Small board PCB size: 32 14mm/1.26 0.55". 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.