Used with loudspeakers, sound amplifiers for training, presentations and a tour guide. UHF wireless technology with low power consumption, high noise immunity, the range of more than 50 m Ability to connect more than 40 devices used simultaneously without crosstalk. Condenser cartridge, high sensitivity, clear vocals. Lithium-ion rechargeable battery lasts for 4-5 hours. Specifications: • Frequency: 60 Hz-16 kHz • radio frequency: 630 MHz - 890 MHz • Operating voltage: DC2,5 - 5,5V • Battery: Lithium-Ion Battery 400 mAh • Charging Voltage: DC5V / 100mA • Charging time: about 4 hours • Working time: about 4-5 hours • Sensitivity: from -51 to -54 dB • Working distance: open area 50m • Net weight: about 22 g of the receiver; Transmitter about 39 g