IMAGE&reg; Mini Digital Temperature Controller Thermostat Aquarium Sensor STC-1000 pp Measure range: -50~+99oC. Mounting size: 71*29mm. Auto switch between refrigerating and heating. Auto switch between refrigerating and heating. Retrun difference value. Front panel size: 2.95" x 1.35", Mounting size: 2.79" x 1.14", Product size: 2.95" x 1.35" x 3.34" Sensor length 2 minclude the probe. Voltage:110-120V Package includes: 1 x Mini Digital Temperature Controller Thermostat Aquarium, 1 x Temperature sensor probe with 2M cable, 1 x Instruction Manual, In Retail Package.