I purchased this about a year ago, but I've only used it a few times and it has no noticeable scratches. 【Audio Specifications】 Frequency Response: 20Hz ~ 20kHz Sample Rate: 24bit / 48kHz Latency: Less than 3ms Dynamic Range: 96dB 【Controls and Connectivity】 Top Panel Controls & Display: Power Button LED Indicator Rear Panel Control: USB Type-C Charging Port Wireless Connectivity: Positive Grid Proprietary Wireless Audio (2.4GHz) Transmission Range: 20 meters Supported Channels: 4 channels 【Included Items】 Spark LINK TX (Transmitter) Spark LINK RX (Receiver) USB A to C Cable (1.5m) Quick Start Guide Safety Instructions Card 【Power】 Main Input Power: DC 5V/1A (USB) Operating Time: Up to 6 hours Charging Time: 2 hours