The ShakeAwake from Time Eyesight is really a pocket-size and portable alarm clock that operates on battery energy. It's ideal for travel or everytime you're not close to a wall outlet. This shaker unit is actually a round receiver that seems to be much like the pagers you are handed https://tedomarket.com/product/clock/alarm-clocks/led-desk-lamps-semicircle-quicksand-painting-desk-lamps-room-decoration-creative-birthday-gift-3d-three-dimensional-hourglass-led-night-light/