Petrainer Extra Receiver Collar for 330 yd Remote Training E-Collar PET916/PET998DB, Rechargeable and Waterproof Dog Training Collar with Safe Beep, Vibration and Shock Electronic Electric Collar Accessory only, can NOT be used alone; Used for asin B00W6Y3I3O/B00W6ZHZMI Easy to sync the remote transmitter with the collar receiver Rechargeable collar-receiver, Waterproof receiver, dog can swim in the water Drop-proof design Improved charging mechanism. (NOTE: Before you place an order, please be sure to ask customer service for model you want to match)