These ultra slim, pre-mounted e-textile LEDs from Electro Fashion run off a 3V coin cell battery and are illuminated continuously when powered. They have connections to which the conductive thread can be connected. These are clearly marked with '+' and '-' to indicate which is the positive and which is the negative connection. The PCBs are double sided making the conductive thread connection very reliable. Contents:5 x Individual LEDs (ready to use):. 1 x White,. 1 x Blue,. 1 x Red,. 1 x Green,. 1 x Sakuru (Lilac). Dimensions: (L)15mm x (W)6.5mm x (H)2.7mm.