Features: 1. Widely used in classroom for classroom audio enhancement. 2. Ir code, easy to set up the link between the transmitter and receiver. 3. Hnad free and portable, neck pendant design. The voice does not drop out even the teacher facing the whiteboard. 4. Excellent noise filter, no cross talk, long distance transmit ability. 5. Support interactive talk when using two microphones. 6. Work under 2. 4g frequency, more stable and wide transmission. Application: Classroom, conference room Specification: Easymic r-e2 Dc power 7.5v Output current:100ma/160ma(working) Color:painting gray/black + red Weight:1.1kg Dimension standard 1/2u Frequency 2402~2480mh2(auto) Sensitivit y 82dbm(0.1%ber) Frequency response 50hz~20khz(3db) Snr:ú+90db Pattern :gfsk, bt=0.5gaussian Link:ir code Antenna:sma/tw Easymic t-e2 Working duration:í²6hrs Charging duration:ín4hrs Battery :3.7v/500ma, lithium battery Battery life ú+500times(full charged and full released) Working mode:ir code connection, auto frequency hopping Use mode:hand-set/neck-set/land-set Emission power:20mw Emission length:50m Frequency :2402~2480mh2(auto), ism Link:ir Sensitivity:82dbm(0.1%ber) Fr equency response:50hz~20khz(3db) Snr:ú+90db Pattern :qfsk, bt=0.5gaussian Dimension 23.8mm(w)x16mm(l)x93mm (h) Weight:28g(including battery)