60 LED/m SK6812 NeoPixel Digital RGBW LED Strip, 13.1 ft/reel, Sold by reel

LED resource: SK6812 RGBW SMD5050 LED (SK6812RGBW datasheet)
Input voltage: DC5V 
Maximum Power: 24 watt/meter (all LEDs on full brightness)
Colors: RGBWW (2700-3000K Warm White), RGBW(6000-7000K White)
Qty of LED: 60leds/meter, each LED individually addrressable
Pitch: 16.67mm(1000/60)
Bits/color: 8-bits/color, 32-bit/pixel
FPC size: 10mm wide
Length: 4 meter (13.1ft) a roll
FPC color: BLACK PCB
Optional Waterproof: Non-waterproof or Waterproof-Silicon Tube (IP67) 
Cuttable: every LED is cuttable

SK6812RGBW is a smart LED control circuit and light emitting circuit in one controlled LED source, which has the shape of a 5050 LED chip. Each lighting element is a pixel, and the intensities of the pixels are contained within the intelligent digital interface input. The output is driven by patented PWM technology, which effectively guarantees high consistency of the color of the pixels. The control circuit consists of a signal shaping amplification circuit, a built-in constant current circuit, and a high precision RC oscillator.

The data protocol being used is unipolar NRZ communication mode. The 32-bit data is transmitted from the controller to DIN of the first element, and if it is accepted it is extracted pixel to pixel. After an internal data latch, the remaining data is passed through the internal amplification circuit and sent out on the DO port to the remaining pixels. The pixel is reset after the end of DIN. Using automatic shaping forwarding technology makes the number of cascaded pixels without signal transmission only limited by signal transmission speed.