Overview

The ELECOM Relacon M-RT1DRBK is a handheld wireless trackball designed to be gripped in the hand rather than pushed across a desk. Because it needs no flat surface to track on, it lets you move the pointer while lounging on a sofa, lying in bed, or leaning back in a chair. The model number is M-RT1DRBK and the finish is black.
The body is shaped so it can be held in either the left or right hand, with the thumb rolling the ball. Left and right click buttons sit alongside media control buttons placed where they can be pressed without shifting your grip, so playback and volume changes do not require reaching for a keyboard. The optical sensor uses a reflective lens matched to the ball's clear coating, and ELECOM describes tuning the ball color, coating thickness, and the amount and particle size of the silver powder to sharpen pointer tracking.
The support bearings use 2.5mm artificial rubies, which helps the ball keep spinning smoothly. Dimensions are roughly 41 mm long, 112 mm wide, and 57 mm high, with a weight of about 77 g — a compact shell built around being held. Connection is wireless through a bundled receiver, which puts it in a clearly different role from a conventional desk mouse.

Connectivity & Compatibility

You plug the included receiver into a USB port on your computer and the mouse connects wirelessly. There is no pairing routine to repeat the way there is with Bluetooth, which suits a secondary machine in the living room or a notebook in the bedroom where you want input to work the moment you sit down.
The natural fit is any situation where you want to control the screen without sitting at a desk. Video playback and browsing, where the pointer does not need to travel far or land with pixel precision, play to its strengths. Tasks that demand long stretches of fine positioning are a poorer match. Because the pointer moves by rolling a ball with your thumb rather than sliding your wrist, the feel differs from a standard optical mouse, and it is reasonable to expect a short adjustment period after it arrives.
This is not a gaming-oriented device. It is not built for aiming precision or response-time competition; treat it as an input tool for using a PC away from the desk.

Product Info

It launched on November 20, 2019 and is still sold today, making it a long-running model. At around the low 6,000 yen range it sits in the entry-to-mid tier for handheld trackballs. Compared with ELECOM's desk-bound trackballs, the grip-style shape and the media buttons are what the price buys, and it is easy to justify as a second input device for a living room or bedroom setup.

Best Use Cases

  • People who use a notebook on the sofa or in bed: no flat desk is required to move the pointer, so video and browser work stay comfortable in a reclined position. Anyone who finishes all work at a desk does not need it.
  • Households with a home-theater PC in the living room: the media buttons sit under your grip, cutting trips to the keyboard for play and volume. Not for people who do fine cursor work all day.
  • Users trying to reduce wrist movement: the thumb-rolled ball removes the need to slide a mouse across a surface. Not suited to players whose main use is fast-aim gaming.

Product Disclosure (Amazon)

  • Model: M-RT1DRBK
  • ASIN: B07ZKL66GY
  • Note: This article covers a manufacturer-made product based on Amazon listing details.