MU101C wired blue ray mouse is ideal for use in a quiet environment; its silent micro switch lets you get rid of clicking noise (only around 20dB) and no more worries about annoying others. More concentration, more efficiency. Instant DPI switch (1000/1600/2400/3200) and easy scroll button for non-slip and accurate control. The blue ray sensor precisely detects motion on various surfaces, including wood, plastic, fabric and etc., tracking smoothly without a mouse pad. Its friendly ambidextrous shape is suitable for both left-hand and right-hand users. 1500mm cable provides a flexible solution to any scenario usage. MU101C is a great choice for work and play.