Do you think Android tablet is too big, maybe you will like this: it just like a USB stick drive, but built-in Android OS inside. It has a HDMI port and a mini USB prot, connect it with your TV, or computer when you want to startup by a HDMI cable, and operate it by mouse or keyboard through a OTG cable.

Android 4.0 Mini PC MK802 has a 1GHz Allwinner A10 processer, 512MB RAM and 4GB storage. It also has a microSD slot for extenal memory, up to 32GB.

Specification

Model: MK802
Processor: 1GHz Allwinner A10
Operation System: Android Ice Cream Sandwich OS (Android 4.0.3 OS)
RAM: 512MB DDR3
Storage: 4GB
Shell Material: Plastic
Screen: None
 Extend Card: Support TF card up to 32GB
Flash: Support Flash 11
Video: 1080P, AVI/MOV/MP4/RMVB/FLV/MKV
Music: MP3/WMA/WAV/APE/AAC/FLAC/OGG 
Ebook: TXT, PDF, HTML, RTF, FB2
Email and Browser: Yes, built in
Earphone Interface: 3.5mm
Language: English, Spanish, French, German, Italian, Arabic, Czech, Chinese
Other Applications: Office, Browser, Gallery, Clock, Calculator, Calendar, Taskiller, Gmail
Extend Port: 1 x MINI USB port, 1 x 3.5mm earphone port, 1 x TF card port, 1 x HDMI port