Product Description. Portable, compact and lightweight size that makes it ideal for traveling, in a hotel room and varsity dorm room. Sleek and exclusive woodgrain 128 dB door alarm easily wedges under any door with no installation needed, making it ideal for personal safety. Anti-slide rubber reinforced base wedges securely everytime. On/off switch prevents accidental activation. Loud 120dB Alarm. On/Off Switch. Operates On Long Lasting LR1130 Batteries. Dimensions: 5.38" x 2.25" x 1.25". Weight: 0.161 lbs.