Black Diamond Cosmo Headlamps Piton Purple All Sizes. The Cosmo is constructed partially from recycled materials and the user interface includes a second switch for easy lighting mode selection. Its Dual-Fuel versatility means this headlamp runs on either a rechargeable BD 1500 Li-ion battery (sold separately) or with three AAA batteries. Features of Black Diamond Cosmo Headlamps 350 Lumen max output Dual-Fuel: Maximum flexibility to utilize either AAAs or use rechargeable BD 1500 Li-ion battery (sold separately) to charge directly into the light via USB-C Save your night vision with a Red LED that has adjustable brightness and strobe modes and is quickly activated with dual-button interface Modes: adjustable brightness red light and strobe Multifaceted optical lens design Mode Memory: turn the light on and off at your designated brightness Long lasting low-profile durable battery door latch and integrated latch opening tool (located on headband adjustment glide Integrated battery meter & USB-C charge-in capabilities with BD 1500 battery (sold separately) IPX7: Waterproof-Tested to operate up to 1 meter underwater for 30 minutes Package Contents: Black Diamond Cosmo Headlamps Black Diamond BD6207455022ALL1: Cosmo Headlamps Piton Purple All Sizes