Technical Specifications:

• Bluetooth version: V3.0+EDR
• Frequency: 2.4026GHz-2.480GHz
• Transmission distance: 10M / 32.80ft
• Transmission distance of Mic: ≤1M / 3.28ft
• Li-ion Battery: 3.7V/100mA 
• Charging time: 2 hours
• Number of charge: > 1000 times
• Charging voltage: DC 5V
• Standby time: 60 hours or so
• Continuous working time: about 3.5 hours
• Bluetooth name: Avanca BM/Bluetooth Hat/BT-03S (you may search one of them)
• Color: Blue, black, gray, light gray (optional)
• Item weight: 87g / 3.05oz
• Package size: 19 x 15 x 2CM
• Package weight: 117g / 4.11oz

User tips:

• The music Bluetooth hat is designed to be reused and it is washable. Therefor the icon panel on the hat is not fixed to the buttons. If you the icons do not match the control buttons, please manually adjust them. 
• The control panel is perfectly positioned if you see full indication light from the light window.
• Press the ON/OFF button for 3 seconds, the device is open once "BLUE" LED slowly flash. Press 3 seconds again, device close.
• Press the ON/OFF button for 5 seconds while RED & BLUE LED slowly flashing alternately, device is on pairing mode.
• Due to different Bluetooth module, you may search one of the Bluetooth name: "Avanca BM", "Bluetooth Hat", "BT-03S" on the Bluetooth device list of your smart phone, no password needed.
• Make sure you enable both call audio and media audio on your Bluetooth set up menu on your phone.
• You might have to manually adjust the hat to find the Micro USB charging port because the Bluetooth hat is washable.