Three functions: Sound Warning, Electic Shock and Vibration. It is worth more than the price * The best static impulse can quickly and effectively curb the improper deeds of the pet * Dimension: 65 x 30 x 34 mm(L*H*W). Weight:3.49oz/99g. Collar length: adjustable design (maximum 57cm approx.) * Good Anti-barking collar for Small, Medium & Large-sized dogs * Shock level is fully adjustable. It is totally automatical, and very Easy to use