Effortlessly control and gain the attention of your dog with the Dogtra X1 Additional Transmitter for 280X Training System. It's part of the next generation of the trusted 280C e-collar dog-training system. The intuitive design and front-and-center command button ensure you never miss a teaching moment. With tone, vibration, and BOOST for faster recall and focus. Fully waterproof and drop-proof, this Dogtra transmitter is perfect for any adventure. Package contains 1 e-collar remote transmitter. 1-handed control Central command button 3-dog expandable Boost and level lock Durable double remote casing Nick, Continuous, and Vibration modes .5-mile range 100 medium output levels IPX9K waterproof rating