Model: gf-307Pro.Spc.: 18*6*3cmFunction explanationBatteries(aaa 1.5v*4),dc 5v(usb cable for pc),or ac (output 6v,300-800ma)Speaker size:40mmx2w*2(4ohms)Output power:2w*2(1khz 10% thd)Erequency:150hz-

Model: Gf-800aFunction explanationPower supply: Battery(aaa 1.5v*4)Speaker unit:52mmx2w*2(4ohms)Output power:2w(1khz 10% thd)Erequency response:150hz-18khzN. W. Kg:15kg/ctnCtn. Size(cm):54.5*42*42Qty/

Model: Gf-800bFunction explanationPower supply: Battery(aaa 1.5v*4)Speaker unit:52mmx2w(4ohms)Output power:2w(1khz 10% thd)Erequency response:150hz-18khzN. W. Kg:15kg/ctnCtn. Size(cm):58*37*37Qty/ctn(

Model: Gf-800cFunction explanationPower supply: Battery(aaa 1.5v*4)Speaker unit:52mmx2w(4ohms)Output power:2w(1khz 10% thd)N. W. Kg:12kg/ctnCtn. Size(cm):52*88*48Qty/ctn(pcs):20pcsRemark: Yellow

Model: GF-803Function explanationpower supply DC 6 Volt ( AAA batteries * 4 )Or AC adaptor output powr =2+2W/channel, @8 OHM @10% THD speaker 34mm speaker , 4ohmssignal cable 80cm 2 Head cableN.W.kg:

Model: GF-805Pro.Spc.: 15.5*15.5*6.5cmFunction explanationpower supply DC 6 Volt ( AAA batteries * 4 )Or AC adaptor output power =2+2W/channel, @8 OHM @10% THD speaker 34mm speaker , 4ohmssignal cable

Model: GF-807Pro.Spc.4.5*5.3*3.4cmFunction explanationoutput:2W * 2 ( d 31mm )Sensitivity: 82 ± 3dbimpedance:8 ± 15%Distortion:0.5%Lithium ion battery output:3.6VLithium ion battery input:4.

Model: GF-807Pro.Spc.: 4.5*5.3*3.4cmFunction explanationoutput:2W * 2 ( d 31mm )Sensitivity:82 ± 3dbimpedance:8 ± 15%Distortion:0.5%Lithium ion battery output:3.6VLithium ion battery input:4

Model: GF-822Pro.Spc.: 15*12*3cmFunction explanationOutput power: 1.5W * 2Lose a true degree:0.5%1W1KHzInput sensitivity:>80 dBsErequency response: 20-20KHz(-3dB)Passage insulation: >35 dBsFixed Resis