JOLLY plastic heaters are designed for small freshwater tanks, marine tanks, and turtle tanks. Their plastic casing makes them durable and very safe. These heaters can be placed under gravel, making them a good choice for turtle or reptile tanks. The JOLLY device always operates when submerged in water and stops working only when unplugged. The built-in thermal protection activates when the heaters are not underwater, preventing overheating (the LED light turns off even if JOLLY is plugged in). Performance may vary according to the following factors: - Amount of water - Room temperature - Open or closed tank Key Features: - Reinforced plastic casing for full submersion and shatterproof design - Accurate electronic thermostat set to 25°C - 77°F - Red ON - OFF light - Holder with strong suction cups - Automatic shut-off when the desired temperature is reached - 230-240 V / 50 Hz - 22 watts - 1.5 m cable length