Great addition to the Tenga, especially for price
If you get the Tenga, GET THIS. Tired of cold devices? This warms it up well but don't expect it to hold the heat that well. Though they don't advise this, I find leaving it in during use is best but I like the warmth a lot. It is a slight pain to reuse. You have to boil it wrapped loosely in cloth (a dish rag is perfect) for 4-5 minutes till it becomes liquid again. The instructions don't tell you this but you don't have to do this immediately after masturbation. Days later works fine just it will take about 15 minutes to cooldown after boling. Initially, I had a hard time clicking the little metal piece inside to start the warming. Takes getting used to. Try clicking not so near the edge (which is what the instructions tell you to do) and press with your fingernail. Good for about 15 uses but hey, it's super cheap.