MOCREO ST4 WiFi Thermometer Freezer Alarm, Email Alert, App Notification, Data Record Export, No Subscription Fee, Remote Wireless Temperature Sensor for Refrigerator, Freezer, Hot Tub (2 Pack) 411. 900+ bought in past month. $7699 ($38.50/Count) Save $7.00 with coupon. FREE delivery Sat, Jul 15.