Very happy to serve you, dear customer! 1. we will DO NOT put any invoices, QR codes, promotions in the shipment, So Dont worry, Just buy it, we will do anything well for you. 2.We are guarantee each device be tested rigorous before shipped out, SO all products can guarantee 100% high quality before sent out. If you have any questions, please feel free to contact customer service, we will solve it for you, please do not give bad reviews at will, thank you in advance. 2021 New Professional Swimming headphone (Original Items) Features: 1.IP68 deep waterproof 2. Open bone conduction technology 3. Built-in 16G memory, single track storage capacity 3000+ 4. Long battery life, about 5 hours. 5. Painless and more comfortable. 6. Bluetooth 5.1, smart continuous connection. 7. Not easy to fall 8. Multifunctional earplugs, perfect fixation, daily noise reduction. 9. Compatible with glasses. 10. Multi-function buttons. Package Included: Headphone * 1 user guide * 1 charging cable * 1 earplugs * 1 pair