Just received an email from Tandem with information about the Tslim temperature sensor. I like that it has an alarm, but do not like that it will shut down delivery. As some one who works in extreme temperatures (up to 120-140F ambient), I'd much rather continue to receive potentially compromised insulin than be unable to receive any at all. "-When the insulin inside the pump is exposed to heat above 98.6°F, the alarm will sound and insulin delivery will be stopped. At this point, the insulin may no longer be safe to use and should be monitored and discarded if you experience high blood sugar without other causes (according to the insulin manufacturer’s instructions). -When the alarm sounds, the pump needs to be removed from the heat source before insulin delivery can be resumed. You should replace the cartridge and insulin as soon as possible. -This feature was designed to protect you from receiving affected insulin. Your t:slim Pump has been tested to operate in a wide range of temperatures from -4°F to 140°F so even when the temperature alarm is triggered, your pump is not in danger."