Longer wireless range Longer battery life Essential Info Monitor doors and windows with this improved Long Range Wireless Door / Window Sensor. It has a longer range and longer battery life than the standard door / window sensor. Magnetic contacts can be replaced with most NC (normally closed) sensors sold at Smarthome. The Long Range Wireless Door / Window Sensor cannot be switched to NO (normally open) sensor capability. Requires 2 AA batteries (sold separately). Please note: this unit does not directly send X10 signals — it must be used with the security console. Manuals/Software Door/Window Sensor Manual (24KB) What's Included Long Range Wireless Door/Window Sensor