eForCity Universal Bluetooth Transmitter with 3.5 mm Audio Cable , Black Listen to music on any Bluetooth compatible headphone, hearing aid, speaker or more Standard Convention / Signal Output: Bluetooth V2.0, Class II / Power Supply: 5V DC, 100 - 240V AC adapter Listen/ Stand by time: Up to 8 hours/ Up to 160 hours. Size: 60 x 25 x 9 mm Includes: Bluetooth Transmitter, Charging Cable Accessory ONLY.