Advanced technology goods finder practical and convenient for seeking for important things When you urgently need to use a certain goods and you can not find it you can use it to solve your trouble With wireless emitter and receiver code matching function high interruption resisting Compact size easy to carry - Color: Black - Includes a transmitter & two receivers - With BB sound alarm & flashing LED indicator light - Operation range: 2~20m - Each receiver powered by 2 x CR2032 batteries (included) - Transmitter powered by 1 x 12A/12V battery (included) Note: -- Please pay attention to change battery after 6-10 months How to use: -- The goods finder composed of emitter and receiver the remote control unit sends signal to the wireless receiver -- when getting the signal from emitter the receiver will response immediately and send out warning sound B.B.B and LED light will be flashing which will let you find the goods that you are looking for Emitter size (L x W x T): 115 x 20 x 20 mm/ 4.53 x 0.79 x 0.79 in Receiver size (L x W x T): 55 x 34 x 20 mm/ 2.17 x 1.34 x 0.79 in