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FM modulation mode with frequency range of 87-108MHZ Setting transmitter frequency by frequency adjustive button LCD-display indicates transmitter frequency and battery level for convenient operation. Automatic locking function to prevent changing transmitter frequency 3.5mm audio input socket for supporting microphone signal input and line input, such as DVD, MP3 Built-in intelligent charging circuit and lithium-ion battery for circularly recharging, fast charging time is about 4hrs and long playtime is about 10hrs. Long operating range up to 30m or more, matching with amplifier or FM radio which is with FM receiving function to achieve wireless amplifier function Frequency Range: 88-108MHz Transmit Power:≤10MW Operating Range: 30m Frequency Control: PLL (frequency step: 0.1MHz) Audio Frequency Response: 60Hz-15kHz Operating Voltage: 3.7V lithium-ion battery Recharging Socket: DC 5V USB port Recharging Time: approx. 4hrs Playtime: approx. 10hrs Product Dimension: 94.5×36×21mm Net Weight: 66g TCM-390 lavalier microphone/1pc USB charge cable/1pc Hanging strap/1pc User manual/1pc Packing: Color box