Specifications include, but are not limited to: 1 30 GPS-Iridium doe mule deer collars with timed release. 2 10 GPS-Iridium buck mule deer collars with expandable belting. 3 Collars must come with remote 2-way communication 4 User- programmable GPS schedule 5 User-programmable VHF beacon 6 Collar attachment /release options For doe collars: timed-release mechanism For buck collars: no timed release, but with expandable belting allowing for ~15 cm of additional neck circumference during rut, but retracting to normal afterwards 7 Appropriate battery size /weight for doe and buck mule deer, with minimum battery life of 2 years collecting 12 points/day 8 Remote mortality notification via SMS text message and or email 9 Access to collars and data whether through software, hardware or webservice included in cost.