Function: 1. 1 Control 4: Equipped with four key finders, you can set the receiver to four items and just press the color-coded button to find them. 2. Simple method of use: just follow the instructions of the manual, you can easily use and operate it and find your item successfully. 3. Sound and light function: equipped with light and sound prompts, when the gear receiver emits a sound, it will guide you to your lost items. It is also equipped with a light that improves visibility at night. 4. Professional Design: It comes with a radio frequency that can penetrate walls, floors, pillows, leather, etc. to help you find your items. 5. Small size: lightweight and portable, it can be easily held in different places for searching without taking up extra space. Specification: Item Type: Key Finder Material: ABS Remote Size: Approx. 10.5x4.5x1.2cm / 4.1x1.8x0.5in Weight: approx. 131 g / 4.6 oz Remote control battery parameters: 2 AAA batteries (batteries not included) Tracker single battery parameters: 1xCr2032 button battery (battery not included) Scope of application: applicable to any item. Package List: 1 x Remote Control (Battery not included) 4 x Tracker (battery not included) 1 x Base 1 x Accessories 2 stickers 4 x key ring 1 x English manual After installing the product with a battery (battery not included), you can use it.