*利用锁相环技术确保发射和接收更加稳定可靠 *数字收音机功能 *内置DTS(数字调谐系统)技术 *自动记忆关闭接收机收音机功能前的收听频点 *适合美国市场频率49.86MHz *适合欧洲市场频率40.68MHz *Use PLL technology to make sure the transmitting and receiving more reliable and stable *digital radio function *built-in DTS technology *auto lock transmission frequency points when turn on the headphone *auto momorize the FM radio frequency you listened to last time when turn off the FM receiver *suitable frequency:49.86MHz(for American market)40.68MHz(for European market)