... buttons - Bluetooth v2.1 Flower design Bluetooth wireless headset for iphone A, play, pause functions;B, personalized ears shell design ... .4GHz ISM band Modulation: GFSK (Gaussian Frequency shift keying) Transmit power: ≤ 4dBm, Class2 Communication distance: ≤ 10 M, Class2 Sensitivity: ... , SPP, LAN access, Syn-chronization, Fax, PAN, BPP, OPP Power Supply: +3.3 VDC / +1.8 VDC Operating Current: ...