Like many others shopping for a Bluetooth adapter for their car, there appear to be too many choices. After trying a bunch of them out, here are some thoughts. Listed in no particular order, only how they appear in photos from left to right, top to bottom.Nulaxy Bluetooth FM Transmitter - NX09BCADON Bluetooth 5.3 FM Transmitter for car - BC89IMDEN Bluetooth 5.0 FM Transmitter for Car - C57Octeso Upgraded V5.0 FM Bluetooth Transmitter Car - BH347Upgraded Criacr V5.0 Bluetooth FM Transmitter for Car - CarkitFM Transmitter for Car Bluetooth 5.3, RIWUSI (All-Metal) - BC61Octeso New Bluetooth Car Adapter - 48W PD&QC3.0 Bluetooth FM Transmitter - BH549FM JOYROOM Bluetooth 5.3 FM Transmitter Car Adapter, - JJ-CCB01Bluetooth pairing name: “NX09”FM Range: 88.1-107.9LED selection: RGB, yellow/green, purple, teal, white, noneWhen this starts up, you see voltage for a brief window the voice notification is “at normal voltage, Bluetooth mode.” The female voice is really robotic, more so than any of the other adapters. At a passing glance, you could have sworn it said “abnormal voltage,” but looking at the manual that’s not even a possible option. Once connected it says “Bluetooth connection success.” There’s faint line noise at lvl 45 on my OEM Toyota stereo and the adapter set at level 30 (max). You need to long press the >> button until the station flashes and then you can use the << and >> buttons to change station value. If you have an overhanging/underhanging console, you can rotate the adapter so that all the buttons are accessible (microSD/LED selection on left, USB on top, controls on bottom) but since it’s only the right side wall is blank, everything is going to be 90 degrees offset.Bluetooth pairing name: “BC89”FM Range: 87.5-108.0LED selection: red, green, blue, yellow/brown, yellow/green, teal, purple, noneThis is one of two adapters that actually uses real metal (aluminum in the body, though in this case, it’s only the walls of the fat bulb sticking out of the socket. The body of the socket itself is transparent dark blue ABS plastic. Starting up, you see “HI” (no idea why they did this) then voltage for a brief moment, afterwards the female voice notification is “normal voltage, Bluetooth mode, wait for connection.” Then you get “Bluetooth connection success” after pairing. The voice for “normal voltage” enunciates “normal” more clearly than Nulaxy, and oddly “normal voltage” part of the voice is different than “Bluetooth mode, wait for connect.”There’s a small noticeable whine in the line noise at lvl 45 on my OEM Toyota stereo and the adapter set at level 31 (max). The controls are nice. The 4-way joystick like button make it easy to control. You need to long press down to change channel then toggle up and down on joystick to change value. The LED selection button sits on the top of the side wall, but since it’s the only control, it’s easy to rotate to be accessible if your console is in the way.Bluetooth pairing name: “C57”FM Range: 88.1-107.9LED selection: N/AIf you like no frills, this is probably the right adapter. No LED illumination ring at all. There is no notification on voltage. It is just displayed briefly and is only forefront if it’s under 12V, which is when it will blink as an alert. Otherwise, the male voice simply states “waiting for pairing” and then “paired.” The front display is not shiny. It’s just matte black and the LED is illuminated through it. There’s faint line noise at lvl 45 on my OEM Toyota stereo and the adapter set at level 30 (max). You need to long press on center button until the station value is flashing to change the station.Bluetooth pairing name: “BH347”FM Range: 87.5-108.0LED selection: N/AThe female voice on this sounds ok, nothing quirk, but still quite stiff. It goes “Bluetooth mode” then “Bluetooth connected.” There’s faint line noise at lvl 45 on my OEM Toyota stereo and the adapter set at level 30 (max). More so than the C57 and NX09, but less than the BC89. To change the channel, you need to short press the center button then you can use the << and >> to change value. With our overhanging console, we often find ourselves rotating the plug 90 degrees to keep all the buttons accessible.Bluetooth pairing name: “Carkit”FM Range: 88.1-107.9LED selection: red, green, blue, orange, lime, teal, purple, noneThis has a similar voice to the NX09 adapter, but more natural sounding – “normal voltage, wait for connection” and “bluetooth connection success.” It does the same “HI” thing as the BC89 and has the same voice sequence; along with the box design (and model name – BC41) makes me think they are out of the same factory. The “normal voltage” sequence of the voice sounds different here too, similar to BC89; there are two different voices. There’s some slight line noise at lvl 45 on my OEM Toyota stereo and the adapter set at level 30 (max). To change the channel, you need to short press the center button then you can use the << and >> to change value.Bluetooth pairing name: “BC61”FM Range: 87.5-108.0LED selection: N/A (just blue)The voice on this sounds similar to the Carkit and the BC89 (fairly natural) – “power on, Bluetooth waiting for connection” then “Bluetooth connected.” The enunciation in the voice sounds correct, but it’s like they spliced two different parts of a conversation together. The “power” part sounds like it was recorded/generated separately from “on” and there’s a slight “bluue toooth” sound that makes you think that you are listing to two separate words rather than one.It also does the same “HI” start message with battery voltage briefly displayed like the Carkit and BC89. There’s some slight line noise at lvl 45 on my OEM Toyota stereo and the adapter set at level 30 (max). The thing about this that is unique is the all aluminum body construction. You can feel it’s sturdiness. All the controls and ports are in the face, which makes it less cumbersome to fiddle with. Long press down on call button to change station. While it’s nice to have a PD port, it would have been even better to have two full sized USB ports, probably the only gripe.Bluetooth pairing name: “BH549”FM Range: 87.5-108.0LED selection: LED light, low, noneThe battery voltage is displayed briefly on startup, then the voice goes “power on, Bluetooth, waiting for connection” then “Bluetooth is connected.” It sounds awefully similar to the RIWUSI adapter. The “power” and “on” sound ok but there is a distinct “Bluuue tooooth” that follows. It’s much more pronounced and noticeable than the BC61 adapter. Oddly, the second “Bluetooth” in “Bluetooth is connected” sounds fine. There’s some slight line noise at lvl 45 on my OEM Toyota stereo and the adapter set at level 30 (max) that seems a bit more noticeable than other adapters save the whine on the BC89. The buttons on this are a bit frustrating since there’s no tactile feedback. To change the channel, you long press down on the center than use << and >> to tweak station value. However, think of a touchscreen without any vibrate or audio cue. The touch sensor exists but there are no physical buttons in that nothing depresses or moves. That makes you sometimes second guess if you actually touched the button successfully to register a hit. This adapter has a larger face, but even if your console overhangs a bit (like mind), it still small enough that nothing butts up against anything.Bluetooth pairing name: “JJ-CCB01”FM Range: 88.1-107.9LED selection: LED light, noneThe adapter has no voice notification. You see battery voltage briefly and hear a chime when starting up and when Bluetooth is connected. There’s little line noise at lvl 45 on my OEM Toyota stereo and the adapter set at level 30 (max). The controls on this are nice. It’s like a toggle knob. You long press down until channel flashes, then turn the knob left and right to change channel. The knobs only turn maximum about 30 degrees each way similar to car radios, so you kind of flick your way to channel you want to set. The problem for many will be that the dual mics are situated at the top, so if you have an overhanging console, not only does it make it a tight squeeze, but it also blocks a clear path to pickup audio.