Is the headphone too small for you? The BM-170 Wireless Bluetooth V4.0 Earphones with Card Slot can solve your problem. Comfortable to wear， they are suitable for people with different sizes or shapes of heads. Superior material， fine workmanship and scientific design ensure perfect sound quality and insulation. Also， the details are thoughtful. The card slot allows you to enjoy music conveniently. No wire wrapping， the hands-free earphones enable you to listen to music or receive calls conveniently while you are walking， doing sports or housework.                                    Features             Excellent in quality and cost performance<br> Comfortable to wear， they are suitable for people with different sizes or shapes of heads<br> Superior material， fine workmanship and scientific design ensure perfect sound quality and insulation<br> No wire wrapping， the hands-free earphones enable you to listen to music or receive calls while you are walking， doing sports or housework<br> The card slot allows you to listen to music conveniently   <br>                                                            Specifications             Bluetooth Version     Bluetooth 4.0     <br> Talk Time     5 Hours    <br> Music Time     5 Hours    <br> Standby Time     72 Hours    <br> Color     Black     <br> Dimensions     (6.69 x 6.18 x 0.98) " / (17 x 15.7 x 2.5) cm (L x W x H)    <br> Weight     1.69 oz / 48 g     <br>                                                             Package Includes            1 x Ring Collar Music Wireless Headset<br>1 x USB Cable<br>1 x User Manual<br>