After extending an angel round of investment, security startup Bastille just scooped up an additional $1 million in funding from investors including David Cowan of Bessemer Venture Partners.

The company first raised $1.5 million in September of last year, but kept the round open. Tom Noonan and John Huntz provided much of the initial investment.

The company focuses on assessing vulnerabilities in connected devices and detecting possible breaches at the enterprise level. Bastille has yet to launch a formal product, but the company says it will help to secure devices that connect to wireless technologies like Zigbee and Bluetooth, among other communication protocols.

“There are thousands of manufacturers scrambling to bring IoT devices to market without concern for security or privacy,” founder and CEO of Bastille, Chris Rouland, said in a statement.

He’s not wrong. Very few companies that are creating connected devices for the home are particularly focused on security. Hackers at the BlackHat security conference recently showed the ease of hacking Google’s Nest thermostat. And it can be more serious than just taking control of the temperature of your home. To attackers, connected devices are just one more way they can enter a network, whether that’s a home network or an office network.

Bastille’s angel round will help the company kick-off some pilot programs with a select number of financial institutions. The company will formally introduce its product in April at the RSA Conference.