Tesira SEC-4 CK Modular Analogue Input Card 4xMic/Line-In/AEC KitThe Tesira SEC 4 is a modular analog input card for use with Tesira SERVER and SERVER IO devices. Each SEC 4 provides four channels of mic or line level audio input with Acoustic Echo Cancellation and also features Biamp SpeechSense technology, which enhances speech processing by more accurately identifying human speech. Product Features Four channels of balanced mic or line level input with AEC (Acoustic Echo Cancellation) SpeechSense processing