Product features: Brand Name: KZ Model name: KZ ZSN Pro Connectivity : Wired Driver unit: hybird 1BA 1DD Vocalism Principle: Hybrid technology Resistance: 25 ohm Sensitivity: 104 dB/mW Frequency Response Range: 20-40000Hz Control Button: Yes Volume Control: No With Microphone: Optional Connectors: 3.5mm Line Length: 1.2m±3cm What's in the box. 1 x KZ ZSN Pro Earphones 3 x Earbud tips 1 x User manual Notice: 1. Please lower music volume before connecting earphones with audio devices to avoid earbud's diaphragm damage. and suggested to have a rest for a few minutes after every two hours. 2. Yinyoo Audio have the Formal authorization from KZ company , All products in Yinyoo Audio are original.