Vivotek PZ8111W 10x Zoom, Multiple Streams, 802.11b/g/n Wifi, P/T/Z Network Camera 10x Optical Zoom Lens, Motorized Pan/Tilt (Pan: -150 ~ +150; Tilt: -45 ~ +90) Multiple Simultaneous Streams, 3GPP Mobile Surveillance, Built-in 802.11b/g/n WLAN Real-time H.264, MPEG-4 and MJPEG compression (Triple Codec) Two-way Audio, Built-in/External Microphone Switch