See the Adafruit NeoPixel guide for futher information on connecting and controlling WS2812(B) LEDs. You might want to figure out how you're going to control these before buying!
Pre-built controllers such as the SP105E, SP106E, SP107E and SP501E, among many others, are compatible (please send a message if you are unsure about your preferred controller). Alternatively, you can build your own controller using a suitable computer or microcontroller with GPIO pins such as the Raspberry Pi, Arduino, Teensy or ESP8266 (among many others). Adafruit also stipulate the use of a 1000 uF capacitor across the power supply and a single 300-500 ohm resistor on the data pin. The data signal must be 5 V and if your microcontroller outputs 3.3 V then you will also need a logic level shifter. These LEDs are the B variant of WS2812 so they have reverse-polarity protection.
They have JST-SM connectors presoldered and a data in and data out connection so they can be chained in series.
With suitable programming you could display whatever colours or scrolling text you want. The unit requires 5 V and the sustained current draw must not exceed 5 A. If all LEDs are set to white at full brightness, the current draw is ~15 A which is okay for very short periods but not continuously. While the PCB is flexible, it is not suitable for continuous flexing and the traces will eventually break if subject to constant changes in shape. The connectors on the rear allow the boards to be chained in series but power must also be supplied in parallel.
Operating voltage: 5 V.
Dimensions: 8 cm x 8 cm.
Delivery
Orders will be dispatched within one business day, using recycled packaging wherever viable.
By default, all orders are dispatched by Royal Mail Second Class/RM48. If your order is needed urgently, you are encouraged to select an upgraded postage option, such as First Class/RM24 or Royal Mail Special Delivery, during checkout.
Some areas of the UK have experienced a degraded level of service from the Royal Mail, with deliveries as infrequently as once per week or worse. If you are currently affected by this, please contact me before ordering to discuss the possibility of using an alternative courier service.