Magicfly Wireless RF Item Locator Key Finder with Base Support and LED Flashlight, Remote Control, 1 RF Transmitter and 4 Receivers Key finder with LED torch and base One transmitter, four receivers correlated with the four big buttons on the transmitter Find lost keys and other easily lost items quickly with just one press on the color-coded button On/off button which located at the right side of the transmitter allows you to turn on or off the flashlight easily High glossy remote control (transmitter) and base Wireless key finder with key ring. Dock base included. Frequency : 433.92M Hz. One transmitter with 4 receivers (batteries included). Dimension: 105X46X13mm (transmitter); 50X36X11mm (receiver); 75X29mm (base). Battery CR#2032 for receivers included (<span class="a-text-bold">battery lifespan depending on how frequently you use with it.</span> Battery type: AAA1.5V x 2 (Not included). Working distance: 30~40 M in open area. With LED torch function. Long working distance and loud sound; Suitable for personal use, family use, gift and promotional purposes, etc High glossy remote control (transmitter) and base; Find lost keys and other easily lost items quickly with just one press  on the color-coded button,the beep sound and flashes will lead you to  find the lost items;O N/OFF button which located at the right side  of the transmitter allows you to turn on or off the flashlight easily.  This becomes extremely handy when you need to find something in the  dark.