What is claimed is:1. An electronic device, comprising:a housing comprising a shape having a first side, a second side, a third side and a fourth side, wherein the first side is opposite the second side, the third side is opposite the fourth side, and the third and fourth sides connect the first and second sides;a male connector disposed on and protruding from the first side of the housing;a battery in the housing and electrically connected to the male connector;at least two cavities in the housing configured for receiving a first in-ear wireless headphone and a second in-ear wireless headphone, respectively, wherein:a portion of a first cavity of the at least two cavities includes a first contact electrically connected to the battery;a portion of a second cavity of the at least two cavities includes a second contact electrically connected to the battery;the first cavity comprises a first opening in the second side of the housing; andthe second cavity comprises a second opening in the second side of the housing; anda female connector disposed in a protruding portion, wherein the protruding portion is disposed on the second side of the housing between the first and second openings and is electrically connected to the battery;wherein the battery is disposed in the housing between the male connector and the female connector, and between the first contact and second contact;wherein the female connector is configured to charge the battery via a source of electrical power connected through the female connector; andwherein the male connector is configured for connecting to a second electronic device, and the battery is configured for charging the second electronic device when the second electronic device is connected to the electronic device via the male connector and the second electronic device is external to the housing.2. The electronic device according to claim 1, wherein the male connector comprises one of a male micro-USB connector, a male USB-mini connector, a male USB-C connector, and a male lightning connector.3. The electronic device according to claim 1, wherein the battery is configured for charging the first and second in-ear wireless headphones when the first and second in-ear wireless headphones are positioned in the at least two cavities and electrically connected to the first and second contacts.4. The electronic device according to claim 1, wherein:the battery is configured for simultaneously charging the second electronic device and the first and second in-ear wireless headphones when the second electronic device is connected to the electronic device via the male connector, and the first and second in-ear wireless headphones are positioned in the at least two cavities.5. The electronic device according to claim 1, wherein the electronic device is portable.6. The electronic device according to claim 1, wherein:the first cavity extends along the third side; andthe second cavity extends along the fourth side.7. The electronic device according to claim 1, wherein the male connector is covered by a removable cap when the second electronic device is not connected to the electronic device via the male connector.8. The electronic device according to claim 1, further comprising a lid attached to the housing at the second side via a hinge.9. The electronic device according to claim 8, wherein, when in an open position, the lid provides access to the at least two cavities.10. The electronic device according to claim 8, wherein the lid includes a hole which permits access to the female connector when the lid is in a closed position.11. The electronic device according to claim 8, wherein the lid includes a hollow portion having a depth greater than a height of the protruding portion to permit closing of the lid.12. An electronic device, comprising:a housing comprising a shape having a first side, a second side, a third side and a fourth side, wherein the first side is opposite the second side, the third side is opposite the fourth side, and the third and fourth sides connect the first and second sides;a male connector coupled to the first side of the housing;a battery in the housing and electrically connected to the male connector;at least two cavities in the housing configured for receiving a first in-ear headphone device and a second in-ear headphone device, respectively;a first contact at a bottom of a first cavity of the at least two cavities, and a second contact at a bottom of a second cavity of the at least two cavities, wherein the first and second contacts are electrically connected to the battery, the first cavity comprises a first opening in the second side of the housing, and the second cavity comprises a second opening in the second side of the housing; anda female connector disposed in a protruding portion, wherein the protruding portion is disposed on the second side of the housing between the first and second openings and is electrically connected to the battery;wherein the battery is disposed in the housing between the male connector and the female connector, and between the first contact and second contact;wherein the female connector is configured to charge the battery via a source of electrical power connected through the female connector; andwherein the male connector is configured for connecting to a second electronic device, and the battery is configured for charging the second electronic device when the second electronic device is connected to the electronic device via the male connector and the second electronic device is external to the housing.13. The electronic device according to claim 12, wherein the battery is configured for charging the first and second in-ear headphone devices when the first and second in-ear headphone devices are positioned in the at least two cavities and electrically connected to the first and second contacts.14. The electronic device according to claim 12, wherein:the battery is configured for simultaneously charging the second electronic device and the first and second in-ear headphone devices when the second electronic device is connected to the electronic device via the male connector, and first and second in-ear headphone devices are positioned in the at least two cavities.15. The electronic device according to claim 12, wherein:the first cavity extends along the third side; andthe second cavity extends along the fourth side.16. The electronic device according to claim 12, wherein the male connector is covered by a removable cap when the second electronic device is not connected to the electronic device via the male connector.17. The electronic device according to claim 12, further comprising a lid attached to the housing at the second side via a hinge.18. The electronic device according to claim 17, wherein, when in an open position, the lid provides access to the at least two cavities.19. The electronic device according to claim 17, wherein the lid includes a hole which permits access to the female connector when the lid is in a closed position.20. The electronic device according to claim 17, wherein the lid includes a hollow portion having a depth greater than a height of the protruding portion to permit closing of the lid.