Specifications include, but are not limited to: Desert and California Bighorn Sheep – Male Weight: ≤ 700 grams with drop-off mechanism. Collar band includes an expandable section capable of accommodating 5 to 8.5 cm of temporary neck growth. Housing must be waterproof, hermetically sealed within a metal housing with glass-to-metal feed-throughs for connection of GPS, Iridium or Globalstar and VHF antennas, this housing must then be enclosed between two layers of collar belting and encapsulated in urethane. Circumference for Desert Collars: ~36 cm – 45 cm plus expansion Circumference for California Collars: ~40 cm – 50 cm plus expansion. Desert and California Bighorn Sheep – Female Weight ≤ 550 grams with drop off mechanism. Collar band includes an expandable section capable of accommodating 2.5 to 5 cm of seasonal variation in neck size. Collar Circumference: Adjustable to ῀31 cm – 41cm plus expansion Elk – Female Weight: ≤ 800 grams with drop-off mechanism. Collar band includes an expandable section capable of accommodating 2.5 to 5 cm of seasonal variation in neck size. Collar Circumference: Adjustable to 50 cm – 69 cm plus expansion Elk – Male Weight: ≤ 800 grams with drop-off mechanism. Collar band includes an expandable section capable of accommodating up to 20 cm of temporary neck growth. Collar Circumference: 65 cm – 75 cm plus expansion Pronghorn – Either Sex Weight: < 550 grams with drop-off mechanism. Collar band includes an expandable section capable of accommodating 2.5 to 5 cm of seasonal variation in neck size. Collar Circumference: Adjustable to ῀30 cm – 38 cm plus expansion Mule Deer – Female Weight: < 650 grams with drop-off mechanism Collar band includes an expandable section capable of accommodating 2.5 to 5 cm of seasonal variation in neck size. Collar Circumference: Average circumference of 35 cm plus expansion. Mule Deer - Juveniles Weight: < 450 grams with drop-off mechanism Fixed circumference: Average circumference of 25 cm. Mountain Goat Weight <650 grams with drop-off mechanism; expandable section capable of accommodating 5 to 8.5 cm of temporary neck growth. Collar Circumference: ~36 cm – 45 cm plus spacer plus expansion Moose - Female Weight < 1000 grams with drop-off mechanism. Collar band includes an expandable section capable of accommodating 2.5 to 5 cm of seasonal variation in neck size. Collar Circumference: 60-70 cm plus expansion Moose – Male Weight < 1000 grams with drop-off mechanism. Collar band includes an expandable section capable of accommodating up to 20 cm of temporary neck growth. Collar circumference: 70-80 cm plus expansion Mountain Lion – Either Sex Weight: < 500 grams with drop-off mechanism Fixed circumference: 42 cm +/- 10% Black Bear – Female Weight: < 800 grams with drop-off mechanism Fixed circumference: 48 cm +/- 10%. Black Bear – Male Weight: < 800 grams with drop-off mechanism Fixed circumference: 65 cm +/- 10%.