Inside microphone: -48db 20Hz-20KHz, Exterior size: 158x 87x 46cm/78x 20 mm, Outside microphone: -48db 20Hz-16KHz, Working voltage: AC9V/1A, Main sound (sub sound): 3W.
Go down and check coupons out. Remember to check price history if it is available. What is best price?
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 code price check (UTC time):
Banggood
Banggood warehouse is located in Europe 
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Link: Banggood product page
1. ($9.99): BG8892c0
2. ($23.49): BG589b2e
put item in your cart and apply coupon code there 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): Cuponation9, BG8ReviTrage, BG00c906
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for Retevis RT-9908 Dual Way Intercom System [EU]. The lowest price was: $9.99.
Price records source(s): Banggood
Click on image to enlarge. ![Price history for Retevis RT-9908 Dual Way Intercom System [EU]](https://couponsfromchina.com/pricehistory/History36915.png "Retevis RT-9908 Dual Way Intercom System [EU] price history")
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)).