This is the BigBlue Dive Lights 450-Lumen Mini Adjustable-Beam DiveLight Features: Magnetic tail switch Adjustable beam angle via twisting the bezel Excellent choice for a back-up light The CF450M is a powerful little light giving 450 lumens. This light has a magnetic tail switch on/off function, an adjustable beam angle between 7Adeg narrow beam and 37Adeg wider beam, and takes three AAA batteries. This light is a great, versatile light option for any diver, especially as a back-up light.