Accessories Photo browse JPG、JPEG、BMP、GIF supported MID Device 1 pc E-book Function Format Supported TXT、LRC、PDF、Html、Htm、EPUB, etc USB cable 1 pc Max. capacity 20M earphone cable 1 pc WI-FI Function Main chip set Rockchip RK903，802.11b/g Charger 1 pc Transmission rate Max54Mbps Manual 1 pc Transmission Distance Max100m Work Frequency 2.4GHz Packing Recording function Format supported WAV Format Product size 3G function Support external 3G USB-DONGLE wireless network card 3G card or USB-Dongle should buy separately product N.W Working temperature -5 ~ 40 ℃ Box size Languages Simplified Chinese、Traditional Chinese, English,、Japanese、French、German、Spanish, etc pcs/ carton Operation systems supported Android 4.1