The Dogtra ARC HANDSFREE PLUS Additional Receiver, is expandable to 2-dogs and offers a Dogtra HANDSFREE SQUARE, which allows you to control a transmitter discreetly and remotely. You can instantly access different functions at your fingertips and use the ARC HANDSFREE PLUS Additional Receiver for a diverse range of training scenarios. Each HANDSFREE SQUARE can be paired to different functions and allows many users to access any feature, at any time within 33 feet of the transmitter. With comfort and safety in mind, the ARC HANDSFREE PLUS Additional Receiver features an ergonomic receiver shaped to the dog's neck. The IPX9K waterproof rating makes the ARC HANDSFREE PLUS  Additional Receiver ready for the most demanding training conditions. The ARC HANDSFREE PLUS  Additional Receiver is perfect for Dogs as small as 15 lbs. The HANDSFREE SQUARES gives you the freedom to multitask and have discreet fingertip control. Built with a flexible strap and intuitive buckle, the HANDSFREE SQUARE can be fastened to your wrist, palm, or fingers. Expandable up to 14 HANDSFREE SQUARES, Nick, Constant, or Pager functions can be coded for you to operate the system remotely and discreetly.