SV-T640 Function:4bandeq LCDtuner InputImpedance:2.2M FrequencyResponse:20HZ~20KHZ ControlRange: Bass: 12dBat60HZ Middle: 12dBat500HZ Treble: 12dBat3kHz Presence: 12dBat10kHz PowerSupply:9VAlkalineBattery Features:LCDTunerSystem BalancedandUnbalancedoutputjack Dimension:89.00mm(W)ⅹ52.00mm(H) InstallingDimension:81.30mm(W)ⅹ51.50mm(H)