🔧 Unleash Your Inner Tech Wizard with COOLCOLD! Comes with two 9V batteries for immediate use. Quickly identify the right wire pairs in a sea of cables. Use earphones to pinpoint cables in noisy environments. Everything you need for effective cable management in one package. Easily check the status of telephone lines with just the emitter. Low electricity tracking Includes 2x 9V batteries RJ45/RJ11 compatibility The COOLCOLD Lan Tester is a versatile wire tracker designed for professionals, enabling quick identification of RJ45 and RJ11 lines, testing of cable conditions, and efficient telephone line diagnostics. It includes essential accessories and two 9V batteries, making it a must-have tool for network management.