Made of high-quality carbon fiber, it is environmental-friendly,highly efficient and safe to use.
It can ensure the output of heat and keep the water temperature( 25°C)inside the tank steady.
The heating element is highly efficient and compact, completely safe for use.
It is power saving and will not scald your fish and turtle etc.
Have two suckers at the button, so you can hang it in the tank.
Besides, you can also put it in the water, since it is submersible.

Specifications:
Color: Black
Material: Carbon Fiber
Voltage: 220-240V
Plug: EU Plug
Wattage: 16W / 50W(Optional)
Temperature:Steady 25°C(77°F)
Power Cord Length: Approx. 140cm / 55.12in (16W)   136cm / 53.54in (50W)
Heating Rod Size: 13 * 2.5cm / 5.12 * 0.98in (16W)    18 * 3cm / 7.09 * 1.18in (50W)
Item Weight: 131g / 4.62oz(16W)   209g / 7.37oz(50W)
Package Size: 18.5 * 5.5 * 5.3cm / 7.28 * 2.17 * 2.09in(16W)    24 * 6.5 * 6.3cm / 9.45 * 2.56 * 2.48in(50W)
Package Weight: 162.5g / 5.74oz(16W)    253.5g / 8.94oz(50W)

How to choose:
If the room temperature is 25°C , you can use the 16W heater with 16L fish tank; If the temperature is below 15°C, you should choose heater in higher wattage.Besides the room temperature, you should take heat dissipation and sealing of the tank into consideration. 

Note:
1.Our body temperature is around 36°C, so you shouldn't test the water temperature by hands when the heater is working, you can apply a thermometer to test.
2.The steady temperature of this heater is 25°C, when the tank water temperature reaches this point, it will not work to save electricity.