ITEM NAME:20pcs 4x4x3mm Micro Waterproof Copper Tactile Tact Touch Push Button Switch MO.20 Touch Push Button Switch 4x4x3mm. Switch Size : 4 x 4 x 3mm (W L H). Insulation Resistance :100M Ωmin ,100V DC. Dielectric strength :250V AC for 1 min.