For tracking only (not training features) use with Garmin Alpha 10, Alpha 100, and Astro hand held devices. Top-mounted, high-sensitivity GPS and GLONASS receiver. Water resistant to 10 meters. Battery life: 80 hours. Sleep mode. LED beacon lights activated from compatible handheld are visible up to 100 yards away in low-light conditions and at night. T5X comes with a 1” blue collar strap. 3.5″ x 1.75” x 1.85″ (8.9 x 4.4 x 4.7 cm) Weight: 6.6 oz.