The Robic M619 is a high quality, rugged, impact resistant handheld Electronic Whistle & Personal Alarm which emits a loud, clear audible signal with a volume rated up to 125 dB.Electronic whistle/alarm; 2 AA batteries, Lanyard, Instructions, warranty Shipping Details Shipping Type: parcel Free Shipping: true Specifications Maximum Grade Level: College UPC: 021096733047 Allergens: Contains No Allergens Grade Level: Teacher-Parent Resources Specialty Shops: Clearance SUOM Description: Each Brand Name: Robic Description: Electronic Whistle Number Of Batteries: 2 Tone Type: Constant Color: Black