. Plug amp; Play: the transmitter and receiver paired automatically as soon as they have been turned on and it works instantly without effort. It is worth considering, the performer, the speaker. It has a power on/off button and when you turn on the power it connects, so you don't have to worry about pairing and everything else. No complicated setup, just plug the receiver into your device's microphone jack and turn on the transmitter and receiver, then wait for 2 seconds, they will connect automatically. Specification:Input voltage range: DC3.5V-5.5V Maximum current: le; 40mATead Type: Li-ion BatteryCharging Time:lt; 4 hours Continuous working time: 6-8 hours Frequency band: 2400-2483Mhz Modulation method: GFSR transmission mode: 10dbm Transmission distance: 25-30m (in open area),15-20m (with obstacle) depends on the working environmentSpecifications:1 * headset microphone transmitter1 * receiver1*3.5mm to 6.5mm adapter 1*2 in 11 USB cable * user manualNote:Please refer to the measurement. A small measurement error is acceptable within the normal range. There may be a slight color difference due to monitor, camera or other factors, please refer to the physical item.