TRAIN 2 DOGS AT ONCE - This dog training collar supports up to 2 dogs with just one remote. With just one button you can switch between the two collars. Plus, an automatic power-saving mode helps extend battery life when not in use. Dog training collars have multiple modes - Dog training collars dog trainers offer 4 multiple training modes: sound, vibration, light and static shock. You can change the vibration and shock levels from 1 to 100 for a more effective workout. This is more convenient and effective for teaching your dog basic commands and solving behavioral problems. SAFETY LOCK AND REFLECTIVE TPU COLLAR - The keypad can be locked to prevent accidental static shock, allowing you to carry the remote without any accident. Additionally, the collar straps have a reflective coating to allow drivers to see your dog at night. 1000M RANGE - The training collar uses a range of up to 1000 yards, allowing you to easily train your dog anywhere. Note: This range is in a straight line