Maximum 1500 meters calling distance, Talk time: about 6 – 7 hours, Operation distance: 10m, Package Contents: 1x Bluetooth Intercom, 1x Universal Clamp, 1x USB Cable, 1x Screwdriver, 3x Standby Headphone Adhesive Pad, 2x Mini Microphone Clamp, 1x Microphone and Speaker, 1x Interphone Control Cable, 1x Mini Microphone, 1x PTT Adhesive Tape, 1x 2.5mm to 3.5mm Audio Cable, 1x Bilingual Manual in Chinese and English.
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.
Updated:
Price history and price alert
Price history (for all/most countries) for Freedconn T-Rex 15 1500m Motorcycle Intercom is here. The lowest price was: $93.39.
Price records source(s): Gearbest
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)).