Iridium 9575 Extreme Satellite Phone with Prepaid and Postpaid SIM Cards Military-grade durability (MIL-STD 810F) Highest Ingress Protection (IP) rating in the industry (IP65) Battery Standby time: Up to 30 hours Talk time: Up to 4 hours Two-way SMS and short email capability Illuminated weather-resistant keypad Operating Temperature Range: -10 C to +55 C or 14F to 131F