An alarm device or system of alarm devices gives an audible or visual alarm signal about a problem or condition.

Alarm devices include:

Alarms have the capability of causing a fight-or-flight response in humans; a person under this mindset will panic and either flee the perceived danger or attempt to eliminate it, often ignoring rational thought in either case. We can characterise a person in such a state as "alarmed".

With any kind of alarm, the need exists to balance between on the one hand the danger of false alarms (called "false positives") — the signal going off in the absence of a problem — and on the other hand failing to signal an actual problem (called a "false negative"). False alarms can waste resources expensively and can even be dangerous. For example, false alarms of a fire can waste firefighter manpower, making them unavailable for a real fire, and risk injury to firefighters and others as the fire engines race to the alleged fire's location. In addition, false alarms may acclimatise people to ignore alarm signals, and thus possibly to ignore an actual emergency: Aesop's fable of The Boy Who Cried Wolf exemplifies this problem.

Onika Tanya Maraj (born December 8, 1982), known by her stage name Nicki Minaj ( /mɪˈnɑːʒ/), is a Trinidadian-born American rapper and singer-songwriter. She was born in Saint James, Trinidad and Tobago and when she was 5 years of age she moved to the New York City borough of Queens, where she grew up.

After releasing three mixtapes between 2007 and 2009 and being signed to Young Money Entertainment in August 2009, Minaj released her debut album, Pink Friday, in November 2010. It quickly became a commercial success, peaking at number one on the U.S. Billboard 200 and being certified Platinum by the Recording Industry Association of America (RIAA) a month after its release. She became the first female solo artist to have seven singles on the Billboard Hot 100 at the same time. Her second single, "Your Love", reached number 1 on the Billboard Hot Rap Songs chart, making Minaj the first female artist to top the chart unaccompanied since 2002. She also became the first female artist to be included on MTV's Annual Hottest MC List. Minaj was named the 2011 Rising Star by Billboard. Her second studio album, Pink Friday: Roman Reloaded was released on April 3, 2012.

Joshua Winslow "Josh" Groban (born February 27, 1981) is an American singer, songwriter, musician, actor, and record producer. His first four solo albums have been certified multi-platinum, and in 2007, he was charted as the number-one best selling artist in the United States with over 21 million records in that country. To date, he has sold over 24 million albums worldwide, and is the top selling classical artist of the 2000s in the US, according to Nielsen SoundScan.

Groban originally studied acting, but as his voice changed, it developed into a "significant instrument". Groban attended the Los Angeles High School for the Arts, a free public school where students received a conservatory-style education. His life changed when his vocal coach, Seth Riggs, submitted a tape of Josh singing "All I Ask of You", from The Phantom of the Opera, to Riggs' friend, producer, composer and arranger David Foster. Foster called him to stand in for an ailing Andrea Bocelli to rehearse a duet, "The Prayer," with Celine Dion at the rehearsal for the Grammy Awards in 1998.Rosie O'Donnell immediately invited him to appear on her talk show. Foster asked him to sing at the California Governor's Gray Davis' 1999 inauguration. He was cast on Ally McBeal by the show's creator, David E. Kelley, performing "You're Still You" for the 2001 season finale.

Jeff Mills (born 18 June 1963 in Detroit, Michigan) is an American techno DJ and producer.

Starting in the early 1980s, Mills, using the name "The Wizard", was a recurring guest DJ on "The Electrifying Mojo" radio show on WJLB. He performed DJ tricks like beat juggling and scratching during his sets, some of which were pre-recorded.

Mills and former Parliament bass player 'Mad' Mike Banks were founding members of Detroit techno collective Underground Resistance (UR), which embraced revolutionary rhetoric and only appeared in public dressed in ski masks and black combat suits.

Mills never officially left UR, but did relocate from Detroit, first to New York, then Berlin (as a resident at the Tresor club), and then Chicago. There in 1992, with fellow Detroit native Robert Hood, he set up the record label Axis, and later, sub-labels Purpose Maker, Tomorrow, and 6277, all aiming for a more minimal sound than most of the techno being produced in those years.

In his DJ sets, Mills usually uses three decks, a Roland TR-909 drum-machine, and up to seventy records in one hour. Mills' Exhibitionist DVD, from 2004, features him mixing live on three decks and CD player in a studio.

James Nelson "Jim" Stickley III (born September 3, 1970) is a co-founder and the Chief Technology Officer of TraceSecurity Inc., and a published author. He is a cyber security expert who is known for his unique research into vulnerabilities that effect organizations as well as exposing identity theft risks to the average person.

In May 2000 Stickley discovered a buffer overflow vulnerability in the Gauntlet Firewall manufactured by Network Associates. This vulnerability allowed an attacker to remotely execute arbitrary code which resulted in complete compromise of the firewall. Before this discovery, application firewalls had been considered by many security experts to be the most secure solution for protecting networks on the Internet and Network Associates had claimed Gauntlet to be the "Worlds most secure firewall". In September 2001 Stickley discovered an additional buffer overflow vulnerability in the same Gauntlet product.

Stickley was on the CNN program NewsNight With Aaron Brown on August 12, 2005 talking about breaking into financial institutions through social engineering.