Plus they have a 30 day money back guarantee, so why not?

而且他们有 30 天退款保证，那为什么不呢？

Buy with confidence: 21-day money back guarantee!

放心购买：21 天退款保证！

There's a 30 day money back guarantee, so it's entirely risk free.

有 30 天退款保证，因此完全无风险。

Why don't you just send it back? You'll be able to get a full refund because most online retailers offer a seven-day, no-reason, full money back guarantee. Did you purchase delivery insurance?

你为什么不把它寄回去？您将能够获得全额退款，因为大多数在线零售商都提供 7 天无理由全额退款保证。您购买了送货保险吗？