Frequency range VHF:136-174MHz UHF:400-470MHz/350-390 Channels: 16 Channel space: 25 KHz /12.5 KHz Operating temperature range: -20℃~+60℃ Antenna impedance: 50Ω Power supply: DC3.7V(±20%) Battery capacity: 2200mAh(Li-ion) Frequency stability ≤±2.5 ppm Dimension: 59(L)*41(W)*103(H) mm Weight: 220g(including battery pack) Transmitter Transmitting power ≤3W Modulated mode: 16KΦF3E(width)/8K50F3E(narrow) Spurious emissions ≤-36dBm FM noise ≤-40dB Audio distortion ≤5% Adjacent-channel power ≥65 dB(width)/55 dB(narrow) Maximum frequency deviation ≤5KHz(width)/2.5KHz(narrow) Receiver Sensitivity (at 12dB SINARD) ≤0.165μV(Width)/ 0.2μV (narrow) Adjacent channel selectivity ≥60dB(width)/ 50dB (narrow) Intermodulation rejection ratio ≥60dB(width)/ 50dB (narrow) Anti interfere of spurious wave ≥60dB(width)/ 50dB (narrow) SNR ≥45dB(width)/ 40dB (narrow) Audio output power: 0.5W Audio distortion ≤5%