Wireless Mushroom Bluetooth Speakers with Built-in Mic Silicon Suction Suitable for Iphone Ipad Smart Phone Tablets and Bluetooth Enabled Device (Blue) Wireless Bluetooth 2.1+EDR Built-in Microphone functon: Volume +/-, Dial/Hangup: Cute and mini design, suitable for gifts Output power 2W (RMS) : Rechargeable Li battery:Speaker unit: 40mm; Impedance 4Ohm; Frequency response: 280Hz-16KHz Plastic case + Silicone case, feel soft and comfortable: Could be a stand for Smart phones and Tablets Product size 60x60x55mm(LxWxH); Working distance 10 to 13m without obstacles