You can see the battery power from the blinking pattern of the LED on the charging cradle when placing or removing earbuds in/from the charging cradle.  

0~25%        White LED blinks once        
25~50%      White LED blinks twice        
50~75%      White LED blinks three times        
75~100%    White LED blinks four times        
Charging Complete: White LED stays on

*Number of available CR5 charges using charging cradle (500 mAh): 3~4 times (with fully charged charging cradle)
*When the battery of earbuds is not enough you can hear voice prompt "Low Battery"