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"Sicce Jolly heaters are extremely durable & virtually unbreakable plastic units that can be placed beneath aquarium gravel or sand for continual heating. The preset models are precisely calibrated to 77degree F and feature thermal protection to prevent overheating once the preset temperature is achieved, or if the heater runs dry. The Jolly heater is always on when submersed, and only stops working when unplugged or removed from the water.

- Ideal for nano aquariums, terrariums, and paludariums

- Indestructible plastic housing

- Can be placed under gravel or sand

- Chew-safe cord cover

- On-Off LED indicator

- Auto shut off for safety"