Please help me to choose products

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I'm a personnel in a company, not very high salary, i want to earn more money. I don't want to do like "pay to click", "pay to sign up" and others. Because that price is very low and payout time is too long. I want to sell something on ebay, now i have some products, earphone, small generator. I can't put all products online, because the fee is too much, if i don't sell, i will lose money. I anylise the products, if i sell the earphone, there are too much competetor, i have to reduce the price, maybe i can sell many, but the profit is not high. If i sell the small generator, not many people will buy, but it also no competetor, if i sell one item, i will get high profits. Now i'm very touble, which products is better. please give me advice.