SecurityMan SM-8209T Wi-Fi Interference-Free Wireless Baby Monitoring System - Add-on Wireless Camera Compatible with MCYPALMWATCH3 & other SecurityMan 900MHz receivers Interference free from crowded 2.4GHz/5.8GHz devices Built-in alarm triggered by motion and audio detection Transmission: up to 330 ft with clear line of sight or 100 ft indoors Black and white night vision capability up to 15 ft