•               Bluetooth & Charging:
•               Bluetooth 4.1
•               Supports A2DP, AVRCP, HFP, HSP
•               10m wireless range
•               Bluetooth frequency range: 2.4 GHz-2.4835 GHz
•               Up to: 10 hours playback / 13 hours talk time / 250 hours standby time
•               Charge time: Approx. 5 hours
•               Charging input: USB DC 5V
•               Battery: Rechargeable 380mAh Li-polymer battery 

The Sandberg Blue Storm Wireless Headset connects wirelessly to a Bluetooth device such as a mobile phone or tablet computer. Remote control your Bluetooth device with the track and volume controls on the headset. The built-in battery gives 10 hours of playback. Allows you to make hands-free and wireless calls.

   
Earphone:

•               Frequency range: 20 Hz – 20 kHz
•               Impedance: 32 ohms
•               Sensitivity: 108 dB
•               Driver unit: 40 mm

Microphone:

•               Frequency range: 30 Hz – 16 kHz
•               Impedance: 2200 ohms
•               Sensitivity: -52 dB
•               Directivity: Omni