This is a challenging soldering lea ❤This is a challenging soldering learning kit -SMT LED Blink KIt .The three LED colors flash frequently, which is very cool. It's like breathing. | ❤DIY ELECTRONIC KITS - soldering items kits is very suitable for teachers to teach and practice experim soldering ents.Whether you’re an adult, student all suitable, The kit contains high-quality components and detailed instructions on soldering procedures, so you don't have to worry about the problems caused by unfamiliar soldering. | ❤Soldering time is approximately 1 hour,ideal for college students, STEM classes for teens, after school projects (robotics), and more. | ❤We have different skill levels of learning solder kits, flashing, vibrating and sounding So you can learn various soldering practices. We love working with our customers and provide support for all of our products.