Aetertek At-919-1 1000m Remote Control Bark Collar 1 Dog Trainer Rechargeable Shock Collar Submersible (Waterproof) Dog Training Collar Submersible (waterproof) dog trainer, can be immerged in water when swim Rich appearance, Rubber button, give you a better sense of touch Multi-functional shock collar: Vibration, Beep, adjustable Shock, Auto anti bark, LCD Display, Flashlight This list is for 1 dog training, can be upgraded as 2 dog collar if add extra receiverAdjustable TPU strap, fits 6-25"/15cm-65cm neck size Remote range up to 1000M, suitable for sports dog by serious trainer