Amazon cuts 20% off a selection of Samsung SmartThings. (Prices are as marked.) Plus, Prime members receive free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping starts around $7.) These SmartThings purport to let you control, monitor, and secure your home from anywhere in the world. Deal ends April 9. A couple of best bets:

• Samsung SmartThings Arrival Sensor for $23.99 (pictured, low by $7)
• Samsung SmartThings Water Leak Sensor for $31.99 (low by $7)