... (NTSC)Audio input8k8bit, AV×4 (4CH record )8k8bit, AV×4 (8CH record )8k8bit, AV×4 (16CH record )Audio output8k8bit, AV×1 ... (4CH record )8k8bit, AV×1 (8CH record )8k8bit, AV×1 (16CH record )Alerm methodSensor alarm,motion ... HDD)WeightAbout 3Kg with packageExternal Dimension(mm) 330mm(L)×290mm(W)×70mm(H)H.264 Stand-alone DVR RD-6504B H.264 Stand-alone DVR(RD-6504B)