One-touch interconnection, high-definition transmission It uses the QCC5125 HiFi Bluetooth platform, Bluetooth version 5.1. It supports multiple wireless high-definition music protocols including HD/LDAC (LDAC supports the transmission of 96kHz/24bit high-resolution audio) It uses an ES9018K2M Hi-Fi-grade chip, a tailored for two-channel devices. It has lower power consumption, ensures the purity and restoration of the audio signal, and enjoys a more realistic and delicate sound quality experience The body adopts an exquisite all-metal shell. This design subtly weakens the potential impact of external electromagnetic fields on the device's internal circuits and core components, achieving efficient shielding against electromagnetic interference Model:ES9018K2M Type:Mini Amplifier Recommended Headphone Maximum Impedance:501 - 600 Ohm Output Type:COAXIAL,LINE OUT (AUDIO OUT),Balanced Out Input Type:COAXIAL,LINE IN (AUDIO IN),Bluetooth (The product printed words depending on the batch, but this does not affect use) Color:As Shown Material:Metal Package Contents: 1 * Mini Amplifier Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.