Technical requirements Technical index Remark BLE:2.4G Band 2400-2500Mhz; Range Of Frequency Antenna Gain Impendance 1.672dBi Polarization Linear polarization 50Ω operating temperature -20℃ / +55℃ storage temperature -25℃ / +65℃ Frequency ID 4 5 7 8 9 2416 2434 2442 2450 2458 2466 2474 2482 2450 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.81 0.79 0.78 0.77 0.75 0.73 0.71 0.70 0.68 0.69 0.72 Efficiency (dB) -7.65 -7.67 -7.68 -7.69 -7.69 -7.
