The 3/4″ Quick-Snap Bungee Collar Strap is compatible with all FE-560, FT-330, PG-300, ET-300, ET-400, and EZ/PE-900 model receivers as well as the PG-300, Micro RX-070, RX-050, RX-090, BP-504 & RX-1000.
Will fit on neck sizes between 11 1/2 inches and 24 inches.