Garmin T 5FX Quick Start Manual page 8

Mini Dog Collar Device Specifications
Battery type
Operating temperature range
Charging temperature range
Wireless frequencies/protocols
8
Rechargeable, replaceable lithium-ion, 361-00035-09
From -20° to 60°C (from -4° to 140°F)
From 5° to 40°C (from 41° to 104°F)
155 MHz @ 32.77 dBm maximum, 2.4 GHz @ -1.7 dBm maximum
Quick Start Manual