[Remote control] The dog training necklace is designed up to a wide range of you can easily train your dog in the courtyard or the park. [Safety lock button & amp; Amplifier; Memory function] The safety lock button can protect your dog from manipulation. The memory function for parameters makes it easier to use, this means that it is not No need to reset the collar [Waterproof and rechargeable] The 100% waterproof IPX7 receiver’s necklace allows you to train your dogs even on rainy days. But make sure that the load port is closed when the receiver is immersed in water, and do not put it in water for a long time. The transmitter and the rechargeable receiver can be loaded quickly at the same time. Can be used for a long time after a full load [For dogs of different sizes], the adjustable necklace can accommodate dogs of different sizes. & amp; Nbsp;