• Can you do ODM & OEM for us?
• How long does it take to charge a 510 battery?
• Do you have a branch in the USA?
• What certificates does Transpring have?
• Can I refill the cartridge vapes?
• On a full charge, how long does the 510 batteries last?
• Where is my order shipped from?
• Is it necessary to preheat my oil before vaping?
• Is the idea of preheat first put forward by Transpring?
• How to fill Transpring vape cartridges?
• How about my products don't work？
• What payment methods are available?
• How about the lead time and delivery time of my order?
• What shipping methods are available?
• Is shipping for free?
• When can I get the price?
• Can I place a sample order?
• How can I place an order?