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 1, advanced blue-tooth 2.4GHz digital Wireless automatic recognition technology of frequency   A.wide range of auto frequency range:more than 1-30m(Stationary state without obstacle) B.support multiple transmission modes of point to point and point to multiple-point,support to limitless quantity of receiving terminal.
      C.easy to avoid disturb frequency:use blue-tooth ISM of 2.4GHz frequency range,is able to meet the need of multiple-frequency and frequency hopping;system will auto-select the new frequency point when it occurs strong disturb to avoid the disturb frequency.
       D.rapid target frequency,available when starting up.
       E.LCD on wireless receiver will show RF signal when successfully target frequency. F.It is available for any teacher with pencil type wireless microphone in any classroom with wireless receiver;
 2,high sound quality
When successful target frequency,the working frequency is the same between receiver and pencil type wireless microphone,system will auto-transform to analog signal work which ensure the sound quality by original,to make sure the receive signal in hi-fi wide frequency response.avoid the fault of direct adoption of ISM of 2.4GHz(as:signal easy to receive by substance,easy to lose the line,easy to disturb by wireless LAN etc)
 3,USB environmental charger interface
 4,ultra low power consupmption,more power saving:
 Dry battery working time is about 6-10 hours.NI-MH chargeable battery working time is 6-8 hours.
 5,ultra lightweight pencil type design:
 Length of 155MM(includes USB charge interface 170MM),diameter14.77MM,weight of 52G.
 6,input gain optional:
 0dB for handheld using,9dB used for clip or hanging in front of the chest
 7,100 auto-select frequency channels without disturb:
 User can pre-set channels on LCD of receiver,pencil type wireless microphone will auto-select to target frequency when power on.

system index:
target frequency；2.4G
frequency range:740-７６5MHz
adjust method:FM
adjustable range:50MHz wideband
Frequency channels:100
interval:250 KHz
Frequency stability:within ±0.005%
dynamic range:90dB
Maximum deviation:±45KHZ
Audio response:80HZ-12KHz (±3dB)
comprehensive noise rate:>８５dB
comprehensive distortion:≤0.5%
Working temperature:-10℃~+40℃
Operation distance:４0 meter,auto-target frequency distance:3 meter(wide space)

receiver index:
receiver method:The two frequency heterodyne
middle frequency:the first middle frequency:110MHz,the second middle frequency:10.7MHz
Wireless interface:BNC/50 ohm
sensitivity:12 dBµV (80dBS/N)
sensitivity adjust range:12-32 dBµV
Spurious suppression:≥75dB
Maximum output intensity:+10 dBV

pencil type wireless microphone index:
Target frequency；2.4G
wireless pattern: adopts 1/4 wave length,built-in screw antenna,output power:high power 30mW
Spurious suppression:-60dB
Power supply:1 AAA dry battery or chargeable battery
battery working hours:dry batter:6-10 hours. NI-MH chargeable battery:6－8 hours
Charge method:MINI USB charging,able to charge by PC