Loop Bra Holder Case Pouch Holster for fitbit charge 2, flex2, Fitbit One Clip, Fitbit Flex Wristband sport sleep Band Armband, Misfit, Withings Pulse O2, Sony Smartband. fit all bra middle. black It fits fitbit one, fitbit flex, misfit, Withings Pulse O2 , sony smartband size: 1.18 inch X 2.25 inch X 0.8 inch (3cm X 6cm X 2 cm) It can fit all bra straps low weight: 0.3 oz (9 gram) Used for sports & sleep band. PLEASE FASTEN THE pouch TIGHTLY WHILE USING TO AVOID THE FALLING OUT OF THE TRACKER