WIEZ – Collar de entrenamiento inalámbrico para perro eléctrico y perro 2 en 1, doble antena, control de alcance ajustable 100 – 990 pies, resistencia de advertencia ajustable, recargable, inofensivo para todos los perros, para uso en exteriores.[The Smarter Working Mode] With 2. 4GHz technology and dual antenna, the new version signal stability is drastically improved, which is more stable and accurate. It's usable in any outdoor terrain(5 different radius: 100ft 200ft 300ft 500ft 990ft). Upgraded working mode: when your dog is out of range, the collar will sound first, then vibrate, and finally, use low 3. 7V voltage shocks to remind the dog back to the range. The new version is designed to