Model No.JH-900A-WHY you choose it1.cheaper price,professional manufacture2.miniITEstyle,invisible ineither ear3.smaller shape,lighter weight less than 4g4.easy volume control to suitable levels5.nice accessiries free of charge: 2pcs zinc air batteries, to last much long using power 3 pcs different size ear tips, to insure comfortablely fits to ear 2 pcs cleaning tools6.nice smaller gift box package,save much shipping place and shipping fare7.amplify sound up to 40 feets,max sound level at 128 db8.CE ROHS certification-Technical SpecificsBATTERY/LIFETIME_ ZINC AIR /100HRS WORKINGOPERATING CURRENT_5-8 MAPOWER CONSUMPTION_ 10MAFREQUENCY RESPONSE_ 50-12K+/-2.5DBSIGNAL TO NOISE RATIO_ >35DBSENSITIVE_-8DBWEIGHT (battery included)_3.2g