What you need to know Lockly has unveiled two new smart lock devices, the Duo and the Guard. The Lockly Duo is a new deadbolt and latch device with Dual-Locking Technology. The Lockly Guard is meant for sliding or swing-style doors and is well-suited for businesses or rental properties. Today at the Pepcom DigitalExperience! event at this year's virtual CES conference, smart home security company Lockly announced two new smart door locks, the Duo and the Guard. These new devices add to Lockly's impressive portfolio and look to challenge for placement among the best smart locks in the industry. The