E-MART 8800B 800DPI Wireless Mouse Grey +USB Receiver(built-in) 1 x 8800B 2.4G Wireless Optical Mouse Grey 1 x USB Receiver (built-in) 1.57" x 0.98" (L x W x H) Weight	2.01oz / 57g Color	Grey Key Layout	2 Buttons + 1 scroll wheel + 2 page up / down buttons + 1 DPI Resolution	800DPI Battery Type	2 x AAA batteries(not Interface	USB Specifications Mouse type	Optical mouse / wireless