A 20-year-old Helena man admitted breaking into Kessler Elementary School last month and taking $12,000 worth of electronic devices such as iPods and Kindles.
Coty Alan Bass, 20, pleaded guilty to burglary. In a plea bargain, prosecutors moved to dismiss charges of theft and tampering with evidence.
Two other people also face felonies in the incident.
According to prosecutors, Kessler School officials on May 13 reported the theft the previous weekend of $12,499 worth of electronics including Kindles and iPods.
A prosecutor said Bass has been cooperative with the investigation.
District Judge Jeffrey Sherlock released Bass on his own recognizance, with GPS monitoring and strict conditions.
Bass faces an additional burglary charge related to a different incident.
Sherlock set sentencing for Aug. 1.