Dell WM126 Wireless Optical Mouse

2.4 GHz RF wireless USB nano receiver (supports Dell Universal Pairing for up to 6 compatible devices), up to 10 m range, 1000 DPI optical sensor, 3 buttons with scroll wheel, powered by 1 × AA battery (up to 12-month battery life), 94.8 × 57.3 × 35.6 mm, 58 g (without battery).