SPERAS M4 has been newly upgraded, which utilizes advanced high-performance LED Luminus SFT40, emits bright light up to 2000 lumens, and the max beam distance reaches up to 700m. It packs 7 different light modes, Turbo, High, Medium, Low, Strobe and SOS mode, with impressive runtimes (Up to 220 hrs. in ECO mode). With its user-friendly interface and memory function this is an ideal flashlight for daily use, camping etc. Features: Compact and powerful. Utilizes one innovative Luminus SFT40 LED 2.0 that emits 2000 lumens with a beam distance of 700m. Compatible with 18350 or 18650 battery, if you want SPERAS M4 has been newly upgraded, which utilizes advanced high-performance LED Luminus SFT40, emits bright light up to 2000 lumens, and the max beam distance reaches up to 700m. It packs 7 different light modes, Turbo, High, Medium, Low, Strobe and SOS mode, with impressive runtimes (Up to 220 hrs. in ECO mode). With its user-friendly interface and memory function this is an ideal flashlight for daily use, camping etc. Features: Compact and powerful. Utilizes one innovative Luminus SFT40 LED 2.0 that emits 2000 lumens with a beam distance of 700m. Compatible with 18350 or 18650 battery, if you want to use the 18650, please purchase the M4 plus tube. High transmittance PMMA materials used to create a well-designed TIR lens for an optimal light beam. USB-C charging with a smart power indicator system for optimal charge and power status indication. High efficient circuit, flicker-free, and a max of 220 hrs. runtime in ECO mode. Reverse polarity protection to avoid circuit damage when the battery is incorrectly installed. Over charge/discharge protection to extend battery life. Lock function to avoid unintended operation. Aerospace 6061 Aluminum Alloy with Type III Hard-anodizing for a durable and anti-abrasive flashlight. Inside the box: 1* Flashlight 1* 18350 1100mAh battery (put inside the flashlight) 1* USB-C cable 2* O rings 1* Manual Optional accessories: M4 Plus Tube(If you want to use the 18650 battery, you can screw the plus tube on the M4) 18650 Li-lon Battery The review from 1LUMEN:https://1lumen.com/review/speras-m4/