The Pet Life ® Barksafe LED 1-to-3 Dog 1,200 Foot Range 7-Level Vibration and Sound Training Additional Dog Collar is 3-Channel or has the ability to train upto 3 dogs with a single transmitter (additional receivers sold seperately). This device is Non-Shock and offers upto 7 intensity levels consisting of 3 Modes that include Sound, Vibration, and simultanious Sound and Vibration. The Transmitter features an LED Display screen displaying Battery Life, Channel, Operating Modes and Intensity Levels with one-touch and easy-to-control buttons located directly on the transmitter with a safety keypad lock function that prevents accidental usage. The Barksafe operates at a range of upto 350 meters or approximately 1,200 feet. The included dual-connecting USB charger connects to both the transmitter and receiver with a total charge of 1-2 Hours for 15 days of receiver runtime and 25-30 days for the transmitter. Additionally, the Barksafe includes 4 contact points and covers for Short and Long