These come at an excellent value and do exactly what they promise. I echo some previous reviews in that the shock strength will likely be too strong for small dogs as I tried the lowest setting on myself and it was still quite powerful. Otherwise the batteries are holding up extremely well and the beep and vibrate settings are working smashingly to keep my pup focused when we’re out walking, and to stop alert barking. I plan to use this alongside an ultrasonic device I turn on when I’m not home....

Works great! Has tone, vibration and shock. Remote simple to use. Collar adjustable for pretty much any size dog. Works fine on my miniature dachshund. Tone is perfect, vibration strength is good, and shock works even on low setting.