Description: Fine Material: The light tester is of firm and durable plastic and metal made, which is not easy to be broken. Battery Powered: The light tester is designed to be 4 x AA battery powered(not include), which is convenient for us to refill power. Easy Using: The lamp detector is simply designed and can be started and used by us easily, which is a good choice. Telescopic: The light tester is equipped with one telescopic antenna, which is safe when we are testing where the problem is. Portable: The light testing tool is designed to be handheld, which is convenient and easy for us to operate or carry. Specification: Material: Plastic, Metal. Color: Black. Size: Approx. 18.5x2cm/7.28x0.79inch. Antenna Length: Approx. 15cm/5.91inch. Battery: 4 x AA Battery(Not Include). Note: There might be a few color distortions due to different computer resolutions. There might be a slight error due to different hand measurements. Do not pre power button when you are touching antenna by hand. Package Includes: 1 Piece Light Tester(with 1 Piece English Manual).