d/Leather headband?(4) Support TF card, FM radio FoldingOutput power0.25W*2Frequency:20-20KHzTransfer Distance:10mImpedance:32 OHM(Ω)Lithium battery capacity:300mAhPlay/Talk time:6-7hCase Material:ABSWeight:275gColor:blue/green/yellow/orange,etcCertificatesROHS, CE ,FCSpeakerBlack magnetic speaker