Garmin inReach® Messenger Plus hiking dog tracker The standard Alpha 300 does

The standard Alpha 300 does not include these satellite communications hardware features

PHYSICAL SIZE 45 x 45 x 14

Garmin TT25 Extended Battery

14" Flexible Antenna

Garmin inReach® Messenger Plus hiking dog tracker The standard Alpha 300 doesAbout this item Compact SOS satellite communicator enables two way text, photo and voice messaging even in areas with no cell coverage; requires active subscription (some jurisdictions regulate or prohibit the use of satellite communication devices) Connect with your compatible smartphone using the Garmin Messenger app to share your adventures with multiple contacts simultaneously; send text messages with up to 1,600 characters, share photos and send