Winter Bonfire version: Dark grey color, PBT keycap, Winter Bonfire switch (optimized tactile switch) Color – Dark grey Dimensions – 33.83 * 15.05 * 4.73 cm Number of Keys – 81 Layout – ANSI (US) Fully Assembled Weight – 1887 ± 20 g Body Material – Full CNC machined aluminum Plate Material – PC Keycap – Double Shot PBT / Marble-Mallow (Not shine through) Switch Type – Mechanical Stabilizer – Screw-in PCB stabilizerBacklightSouth-facing RGB LED Hot-swappable – Yes. Compatible with most of the 3 pin & 5 pin MX mechanical switches such as Gateron, Cherry MX and Kailh, etc. MCU – Ultra-low-power ARM Cortex-M4 32-bit STM32L432 (128KB Flash) Polling Rate – 1000 Hz (wired) / 90 Hz (wireless) N-Key Rollover (NKRO) – Yes for both wireless and wired modes Battery – 4000 mAh Rechargeable li-polymer battery BT Working Time (Backlit off) – Up to 300 hours (Lab test result may vary by actual use) BT Working Time (RGB) – Up to 100 hours (Lowest brightness) Bluetooth Version – 5.1 Compatible System – Mac / Windows / Linux / Android / iOS Connectivity – Bluetooth / Type-C wired