Brother TD-2120N - Manual (Page 109)

Using the WLAN Interface (Optional:PA-WI-001) (TD-2120N/2130N only)
103
11
Product Specifications
11
Size: Approximately 4.34" (W)  3.35" (D) 
1.03" (H) (110 mm (W)  85 mm (D)  26 mm
(H))
Weight: 0.11 lb (0.050 kg)