TV Tuner Card 
This is a good option regardless of how often it's used. The ability to capture a TV program is a nifty feature no matter how you look at it. Sure TiVo does the same thing, but the files you'll record will be saved on your laptop which means you have more freedom with your content.

Avermedia Volar Go USB (Tk.3600) 
A very well-known brand in terms of TV Tuner cards so you can't go wrong with this option. Plugs in through your USB and can output 1080/720p content easily and as well as record programs. 

For smartphones
Wireless speakers 
The demand for wireless speakers has risen significantly in recent years, thanks to the all in one quality that a smartphone has. A wireless speaker boosts the output of your smartphone so that others can enjoy whatever you are listening to or watching.

Microlab MD-212 Boom Box Bluetooth (Tk.2350)
The design may not win many awards, and the power output is a bit on the low side at just 2 Watts, but then again it doesn't really cost much either. Plus with the onboard mic, this can also be used as a speakerphone.

Logitech X100 Mobile BOOMBOX Speaker (Tk.2900)
Sporting a very funky design, 5hr playback time, built in mic, and 3 Watt power, it's a great pick if you want something eye catching and loud enough for everyone around you to hear what you are listening to. 

F&D Swan W18BT Hi-Fi Audio Speaker (Tk.5000) 
With a killer design and handy size, a modest 2 Watt power, and a capable battery, this will add class and performance on any desk it's placed.

Headphones 
Unanimously, the most important and most used of all accessories available for a smartphone. Whether you are an audiophile (crazy about sound quality) or just need something to drown out the world when commuting, a headphone is paramount in order to complete any smartphone experience.

 Skullcandy Ink'D (Tk.1400) 
Skullcandy's hip looks and various colour options seem to favour the taste of the youth much more than anyone else. Don't go expecting great quality from these though.

JVC HA FX series (Tk.1800)
A solid entry level offering from JVC, it features eye catching design, a decent sound quality and attractive pricing.
Xiaomi Pistons 2 (Tk.1800) 
Don't be fooled by the Chinese name as this company is taking the world by storm through their smartphones, and now they have done their magic in headphones. For the price, these come with metal build, a sound quality that could rival headphones in the $50-$100 price ranges and as a plus, it has mic and three buttons so it can replace your OEM headphones easily.

Power banks 
 A godsend for the active on the go people, this nifty gadget has made running out of charge in awkward times.
Gadmei Elite P520 5200mAh Power Bank Portable Charger (Tk.1650)
TP-Link TL-PB10400 Portable 10400 mAh Dual USB Power Bank (Tk.2400)
Remax Proda 20000 mAh Dual USB Portable Mobile Power Bank (Tk.2800)

Smart watches 
Despite still being in its infancy, the adoption rate for smart watches has gone up like a rocket, and it's not that difficult to see why as it's a logical evolution for the wristwatch. With phones being as large as they are, a smart watch makes more sense for medial tasks such as fitness tracking, texting, etc.

Pebble Steel Smart Watch  (Tk.22000)
Following the initial square face design of most smart watches and sporting leather or metal bands, and very basic screen. Looks may not be its strongest point, but it does retain its charge quite well.

LG G Watch R  (Tk.25000)
Following on the footsteps of the Moto 360, the G Watch R introduces a round face which makes the watch look very much like an expensive sport watch and the beautiful screen makes working on the screen a delight.

Moto 360  (Tk.25900)
The watch that has set trends for all smart watches, the drop dead gorgeous 360 sports a design that can blend in any occasion.

Asus ZenWatch (Tk.20900) 
The cheapest option in this lineup, and also following the square face, Asus has at least managed to make it look classy nonetheless.