Heater for small aquariums, model HT-330XD. This was used for a reptile terrarium. I felt safe using it because it allows you to set both a minimum and maximum temperature. As the number of individuals increased and I switched to air conditioning, it was only used for one season. - Model Name: HT-330XD - Power Supply: AC 100V 50/60Hz - Applicable Temperature Range: 15℃～40℃ - Brand Name: HYDRA Thank you for looking.