E-volve Fast Forward Sports Armband for MP3 players & phones in size: M / color: Black/Silver / compatible with (Sony Walkman NWZ-E430 E430 / / NWZ-E474 / NWZ-E574 / NWZ-E436 NWZ-E438 / NWZ-E439 E439) To fit MP3 players / phones up to 100 mm x 50 mm x 12 mm Velcro strip with 3 settings to fit all sizes of arm (22 cm - 40 cm) Simply styled headphone cord wrap takes up slack Credit card pouch 2 earphone ports (bottom left and right) to accommodate any device