Sensitivity: ≤50dBuV(S/N≥20dB) Extra Weight: 50us 3) TRANSMITTER Modulation: FM Higher Harmonic: 40dB lower than the Datum wave Battery: 3V(2× AA 1.5V) Operating temperature: -10 to 45 ℃ Remarks: Because the product is continuously improving, specification may change. Please forgive us not to inform you. FCC warning statement This device complies with Part 15 of the FCC rules.