• Frequency Range : 400-480M1-14350-390MHzf 136- 174MHz
• Channel Capacity : 32 Channels
• Zone Space : 2 Channels
• Battery Capacity : 1800mAh(LI-ion Battery)
• Operation Voltage : DC: 3.7V ± 10%
• Operating Temperature : -20°C ~ 60°C
• Frequency Stability : ±0.5ppm
• Antenna Impedance : 50Ω
• Weight(Antenna & Battery Included) : 126g
• Dimension(WH'D)(Projections excluded) : 46 x 27 x 90mm 

Transmitter (ETSI EN 300 086 Testing Standard) 

• Output Power : 2W/1W
• Modulation Limiting : ± 2.5@12.5KHz/±5.0@25KHz
• Conducted Spurious Emission : -38dBm<1GHz1/-30dBm›1GHz
• FM Hum&Noise : 45/40dB
• Audio Distortion : ≤3%
• Frequency Stability : ± 1.5ppm

1. Datasheet - SFE SD618
2. User Manual - SFE SD618