... from the air. It is undetectable and does not interfere with the network. Applications: Acoustic Isolation: Theaters, Cinemas, Concert halls, Lecture ... , AMPS, HCMTS , CDMA , TDMA ,TACS , PCS ,1. AC adaptor with DC input jack, AC 220V 50/60Hz, DC 5V 2. Output power ... Purchase Orders:Accepted upon credit approval.---------------------1 pcs: 250 usd(With DHL charge)100 pcs: 120 usd1000 pcs 100 usd