The 'Pocket Cannon' Field Flashlight | Fenix E35R 3100-Lumen Rechargeable Compact Field Instrument

The Experience

3100 lumens. 853 feet of beam reach. A 5000mAh 21700 battery that runs 69 hours at Eco and 2.5 hours at full Turbo blast. All of it packed into a 4.72-inch aluminum body that fits in a shirt pocket and weighs 5.22 ounces. The Pocket Cannon is the Fenix E35R — a compact high-output field flashlight that redefines what a pocket-sized instrument is capable of delivering. Five output levels from 30-lumen Eco to 3100-lumen Turbo, a 2500-lumen strobe, a magnetic tail that turns any metal surface into a hands-free mount, a single side switch that controls everything, and IP68 waterproofing that makes it submersible to 6.6 feet. The Luminus SST70 LED is rated to 50,000 hours. The aircraft-grade aluminum body with HAIII hard-anodized finish won't quit. And the Fenix Limited Lifetime Warranty backs every unit. This is the flashlight for the serious field professional who needs maximum output in minimum space — and refuses to carry something larger to get it.

Scientific Engineering

• 3100-Lumen Maximum Output: The Luminus SST70 LED — one of the highest-output single LEDs in Fenix's production lineup — delivers a maximum 3100 lumens with a beam reaching 853 feet through a 98-degree wide-angle beam that illuminates both immediate surroundings and distant terrain simultaneously. An output level that most flashlights three times the size cannot match.
• Five-Level Output Architecture:
  • Turbo: 3,100 lumens / 2.5 hrs / 853 ft.
  • High: 1,000 lumens / 3.6 hrs / 453 ft.
  • Medium: 350 lumens / 9.3 hrs / 262 ft.
  • Low: 150 lumens / 21.3 hrs / 177 ft.
  • Eco: 30 lumens / 69 hrs / 82 ft.
• 2500-Lumen Strobe: Press and hold the side switch for 1.2 seconds to activate 2500-lumen strobe for emergency signaling — accessible without cycling through output levels.
• Single Side Switch Operation: One metal side switch controls all functions — press for 0.5 seconds for on/off, quick press to cycle through output levels, press and hold for strobe. No tail switch, no secondary controls, no mode confusion. The magnetic tail occupies the space where a tail switch would normally sit.
• 5000mAh 21700 Battery Architecture: The included Fenix ARB-L21-5000 V2.0 21700 rechargeable battery provides 5000mAh of capacity — the largest battery in the compact Fenix flashlight lineup — supporting 69 hours of Eco runtime and meaningful Turbo output without premature step-down. Compatible with the Fenix ALF-18 adapter for 18650 battery use when a 21700 isn't available.
• Intelligent Overheat Protection: Onboard thermal management automatically steps down output when internal temperature reaches threshold — protecting the Luminus SST70 LED and battery during sustained high-output field operation without operator intervention.
• Intelligent Battery Step-Down: When voltage drops below preset levels, the flashlight automatically steps down through output levels to protect the battery — with the battery level indicator flashing red in Eco mode to signal recharge required.
• Magnetic Tail Mount: A strong integrated magnet replaces the traditional tail switch, providing instant hands-free attachment to any ferrous metal surface — vehicle panels, equipment frames, gate hardware, and field station surfaces — for stationary lighting at any angle.
• One-Way Body Clip: A low-profile body clip provides secure pocket or pack carry without adding bulk to the instrument's already compact form factor.
• Double-Click Battery Level Check: Double-click the side switch at any time to activate the battery level indicator for a 3-second status check without turning the light on — green for sufficient, red for low.
• USB-C Rapid Recharge: Full recharge from depleted in approximately 3 hours via the integrated USB-C port. Charging indicator transitions from red to green on completion.
• Electronic Lockout: Double-click the side switch to engage lockout — preventing accidental activation during storage or pocket carry.
• Aircraft-Grade Aluminum Construction: Full CNC machined aircraft-grade aluminum body with HAIII hard-anodized oxidation-resistant finish — built to the same material standard as precision optical and field instruments.
• IP68 Waterproof & Dustproof: Submersible to 6.6 feet for 30 minutes — the highest waterproof rating available, providing complete protection against rain, submersion, and active field conditions.
• 1.5-Meter Drop Resistance: Drop-tested from 1.5 meters onto hard surfaces without damage — the durability standard for serious field instruments.
• Luminus SST70 LED — 50,000-Hour Lifespan: The high-performance cool white LED rated to 50,000 hours of operational lifespan through a polycarbonate lens with antireflective coating for maximum light transmission efficiency.

Boutique & Conservation Values

• Maximum Output, Minimum Footprint: The Pocket Cannon delivers an output level previously reserved for large handheld flashlights in a body small enough for shirt pocket carry — eliminating the size and weight penalty that has historically accompanied serious high-output field illumination.
• 69-Hour Emergency Reserve: The 30-lumen Eco mode's 69-hour runtime transforms The Pocket Cannon from a high-output instrument into a credible emergency light source — a meaningful dual capability for the estate steward or field professional operating in remote environments.
• Fenix Limited Lifetime Warranty: Every Pocket Cannon is backed by Fenix's Limited Lifetime Warranty — 15-day replacement for manufacturing defects, 5-year free repair for normal use issues, and lifetime limited warranty coverage beyond that.

Specifications

• Maximum Output: 3,100 lumens
• Maximum Beam Distance: 853 ft. (260 m)
• Beam Angle: 98°
• Lighting Modes: 5 output levels + Strobe
• Maximum Runtime: 69 hours (Eco, 30 lumens)
• LED: Luminus SST70 Cool White
• LED Lifespan: 50,000 hours
• Color Temperature: ~6500K
• Primary Battery: Fenix ARB-L21-5000 V2.0 21700 5000mAh (included, USB-C rechargeable)
• Backup Compatibility: 18650 battery with Fenix ALF-18 adapter (sold separately)
• Charging: USB-C, ~3 hours to full charge
• Waterproof Rating: IP68 (submersible to 6.6 ft. / 30 min.)
• Drop Resistance: 1.5 m (4.9 ft.)
• Dimensions: 4.72" L x 1.04" dia.
• Weight: 5.22 oz. (including battery)
• Includes: ARB-L21-5000 V2.0 battery, USB-C charging cable, lanyard, spare O-ring, body clip
• Warranty: Fenix Limited Lifetime Warranty
• Shipping Weight: ≈1 lb.