After the release of SLASH R, SLASH RS, and SLASH T, DO has been applauded and praised by many audiophiles as shown in the user reviews. The newly released SLASH 3, SLASH 4, SLASH 5, and SLASH 6 with high-quality audio transmission technology are also developing and establishing themselves as staple products in the high-quality hi-fi Bluetooth audio receiver market. DO understand the importance of R&D has been heavily investing in this department over many years. Through continuous research and analysis, along with detailing every user’s feedback, DO has been able to roll out new products with vast improvements. DO actively reflects the customer's needs for the product obtained through the actual experience of the customers who have loved the SLASH series. In order to implement the best sound quality, we introduced SLASH 8, which combines high-performance headphone amplifier, high-quality USB DAC, and high-quality Bluetooth audio. SLASH 7 combines high-performance headphone amplifier and high-quality USB DAC, which is another evolution of high quality sound.