Bird-X TX-PRO Transonic Pro Non-Toxic 120-Volt 3,500 SQ.FT Pest Chaser, 2-Pack HIGH QUALITY: Powerful Sonic/Ultrasound waves DETERS: Rodents, insects and other pests SAFE DESIGN: Secure, green, and non-toxic Protects up to 3,500 SQ FT HEAVY DUTY, DUAL SPEAKERS