This aluminum and ABS plastic-duo function wireless Bluetooth earbud charging station (earbud included) and power bank in one can gain attention for your brand! Power/Technology: earbud battery capacity: 40 mAh / 3.7V; power bank rechargeable lithium polymer battery: 2000 mAh; Input:5V/1A; Output: 5V/1A, 5V/60 mA; Microphone sensitivity -40 +/-2db; frequency response: 20Hz -20KHz; transmit range: 10m (30 ft.); Bluetooth® version: 4.1; Bluetooth® Profile: A2DP/HFP/HSP/AVRCP. Recipients can pair it with smartphones to listen to music or make hands-free phone calls. Music/Talk time: 3-4 hrs. It must be charged prior to first use and charge time varies by device (minimum two hrs.). Three sizes of ear tips are included. It can only ship to the contiguous United States via ground.