Attach the color-coded receivers to your frequently lost items with the key rings or double sided adhesive tape.With just one on the color-coded button, the beep sound and flashes lead you to find the lost items. You can find the lost items quickly by pressing the color-coded button, the beep sound and flashes lead you to find the lost items. Stick the receivers on your valuables or string the receivers on the included key ring. Got a friend who keeps losing key? Give this key finder as a gift. Remote:Follow the steps below to install batteries into the remote. (1)Remove the battery cover located on the back of the remote; (2)Install the batteries according to the (+) and (-) marks inside the battery compartment; (3)Close the battery cover. Receiver: (1)Open the outer shell with the opening tool provided; (2)Replace CR2032 battery. Colour:Black Material:ABS The color and appearance of some accessories are sent randomly,can not be chosen the specific , which not affect the use Package Contents: 3x Transmitter 18x Receiver 3x Mounting Accessories set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.