Remax RB-T9 Bluetooth Single Earphone With HD Voice is made with HD Voice Metal Texture, it's coding intelligent effectively reduce the impact of environmental noise on music, restore the original beauty of music in a noisy environment for you to keep a quiet .This Bluetooth Earphone has 100 mAh Battery Capacity, 180 hours standby, 5 hours music times up to 10m (free space) operating distance,6 hours Talking time, 5 hours music time, SM(2.402-2.480GHZ) Frequency and restore CD level sound quality.