Features: 1: p2p, pnp: plug and play. No need ddns. No need port forwarding setup. 2: sricam app: supports ios, android smart phones or tablet pcs. 3: microsd card: supports up to 64gb microsd card for recording and playback. 4: alarm: supports motion detection alarm, phone push notification alarm and whistle alarm. 5: ap hotspot: supports monitor on smart phones or tablet pcs by ap hotspot, without internet