• WiFi Smart Door Sensor, Wireless Door Window Detector Alarm with 2 Batteries, Smart Linkage Window Door Contact Sensor for Home Security Compatible with Alexa/Google Assistant, No Hub Required, 2 Pack KWD 10.500
• Smart Door Sensor Alarm Wireless, WiFi Door Window Detector with 8 Batteries, Smart Linkage Window Door Contact Sensor for Home Security Compatible with Alexa/Google Assistant, No Hub Required, 4 Pack KWD 6