CAT B100 Noise-canceling microphone Large-button keypad Withstands temperatures of -25 (-13°F) to 55°C (131°F) The Cat B100 is a phone that thrives in tough conditions. For one thing, it's dust proof and waterproof for 30 minutes when submerged up to 1 meter (3'3"). It's impact-resistant too and can easily survive a drop from 1.8 meters (5'11"). Ambient noise isn't a problem: With its noise-canceling microphone and high-quality speaker, you'll hear the caller and they'll hear you, loud and clear. Above all, this phone is a survivor: it'll thrive in temperatures as low as -25°C (-13°F) and as high as 55°C (131°F). With talk time of up to 10 hours, this phone won't let you down.