TFA WeatherHub

Retrieval of data anywhere and anytime via smartphone, even by multiple users, free app, temperature transmitter for monitoring refrigerator, freezer, aquarium, pool or pond via cable sensor, alarm limits adjustable, push messages in case of alarm event, memory up to 90 days, very easy installation via internet gateway, up to 50 sensors can be connected (868 MHz), system can be expanded with many other transmitter types, incl. gateway, temperature transmitter with waterproof cable sensor, power adapter for gateway, LAN cable

Measuring range: T: -30 to +60°C (-22 to 140°F)
T transmitter: 30.3301.02, 33 (39) x 22 (33) x 87 (92) mm, 31 g, cable length 1m, 2 x 1.5V AAA not included
Gateway: 31.4000.02, 40 (44) x 28 (32) x 104 mm, 66 g
Compatibility: iOS 7.0 or Android 3.2 (and higher), camera required
Packaging: 383g, EK-EL