Power Supply Voltage: 8-25(V), Ringtones: Loud, Power Source: 18650 Battery (Not included), Power Consumption: 170mah(W).
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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 Europe 
. I don’t want to misguide you about the price. I don’t know if it’s good, because I don’t have enough records in my database… I found coupon for you. Check this out.
Link: Banggood product page
1. ($32.89): BG589b2e
this code has to be applied 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): TTBLACK5
(there’s a little possibility that old coupon will work)
Price history and price alert
There is only one database record (it was for $32.19), so you can’t see price history chart.
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)).