Charging input: DC 5.0V=500mA, Standby time: about 800 hours, Supporting protocol: HSP, Sensitivity(SPL): 100dB, Bluetooth version: V4.1, Connecting distance: 10 meters, Charging time: about 3hours, A2DP, AVRCP, HFP, Frequency response: 20Hz-20kHz, Battery capacity: 1400mAh rechargeable battery, Working time: 35 hours, Rated impedance: 32 Ω.
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Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($39.59): BGAFF10OFF
2. ($39.59): bGhOnEy10
3. ($39.99): BGW800
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): 502C6B, 15earbud, TTxBG10, aff7off, BG3CSUM, bgssaff9, AFfbG10, BGW800BT, BGSDC, BGBK15, BG20CES, BGVDay10%off, EARSP11, BG20HP
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Edifier W800BT Wireless Headphones. The lowest price was: $29.99.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).