Features: 1) You can freely set safe distance within 1 - 25 meters 2) Environment friendly, without radiation 3) Sleek, compact and easy to carry within a wide range 4) Reminds losing or theft by vibrating and alarm 5) Ideal for protecting wallets, PC, boxes, purses, pets and remindering baby leaving 6) Searching function and anti-lost function 7) Alarm with vibrating convenient use 8) Easy operation, small size and portable 9) It is widely used for trip to protect the important and valuable things such as babies, mobile phones, pets, bags or other important things you want 10) Safe distance is within 1 - 25 meters 11) Portable Specifications: 1) Transmitter: a) Dimensions: 44 (H) x28 (W) x 8 (D) mm b) Weight: 9.3 kg c) Battery: CR 2032 x 1 (3V) 2) Receiver: a) Dimensions: 460 (H) x 36 (W) x 15 (D) mm b) Weight: 35.5kg c) Battery: No. 7 x 1 (1.5V, AAA size)