Smaller, lighter unit for smaller, lighter hunting dogs. For use with Garmin Pro 550 Plus, Alpha 10, Alpha 100, and Astro hand held devices. Top-mounted, high-sensitivity GPS and GLONASS receiver. Water resistant to 10 meters. Battery life: 16-30  hours. Range 4 miles. LED beacon lights.   .75″” blue collar strap.   Device: 3.1″ x 1.8” x 1.4” (7.8 x 4.5 x 3.5 cm)  Weight: 5.1 oz. Neck size: Minimum of 9.5” (24 cm) in circumference. Free shipping (UPS Ground.)