Features: Strong signal design: transmission range of 30-40m (98-131ft), radio frequency can penetrate walls, floors, etc. This allows you to easily find your items. Easy to use: with just one press of the color-coded button, and a loud beep and flashes will lead you to find lost items. It has a led flashlight on the transmitter, very convenient to find lost key and other items even in dark environment. The transmitter is equipped with a base, so it can be placed on a tea table, TV cabinet, bed, computer desk or bookshelf. Specification: Material: ABS coating Color: as shown in the pictures Frequency: 433,92 MHz Voice: 75-80Db Transmission range: 3040 meters List of packages: 1 * Transmitter 4 * Receivers 1 * base 4 * double-sided sticker 4 * Round Buckle 1 * Instructions