TEK Antenna Retainer Bands give you an easy way to distinguish between multiple dogs. These bands slip on the collar antenna for the TEK Series GPS Location+E-Collar Training system (TEK-V1LT) and GPS Location Only system (TEK-V1L). The colors correspond to your TEK Series Handheld Device's collar color options, so each dog's collar will match the display on your handheld transmitter. 12 color options are included in this pack for differentiating up to 12 dogs' collars.