1、repeat (A-B) 2、play MP3 4、anti-shock ，anti-water ，anti-static， 5、USB memory one year quality warranty (not include shell) support format ：MP3/WMA/WAV quartz citizen ： MIYOTA 2035 byte speed ：32kbps-256kbps work tempreture：-20℃～+70℃； frequency range ：20Hz~20KHz earphone output：5MW+5MW PC port ：USB2.0 MS：Windows98/2000/xp/me/nt Mac OS 8.6 or higher voltage ：3.7V charge voltage ：5.1V Play time : continues more than 9 hours charge time ：about 1.5 hour （first time 4 hours needed ）