... ,GPRS,GSM,Bluetooth Frequency:13.56MHz Functions and Features:1. Compact, portable, and durable.2. Long working time: The product can work for ... processing speed, 512/256/128 MB built-in storage, and 128 MB memory and supports the Micro SD/TF card with a maximum ... mm (width) x 25 mm (thickness)Weight200 g (with batteries)Working EnvironmentOperating temperature–15 to +50°CStorage temperature–20 to +60 ...