Material: Satisfyer specifies silicone and ABS plastic for most models, and writes in its FAQ that the head on all Air Pulse products is made of silicone. Satisfyer rarely publishes an explicit declaration on phthalates, BPA and latex for individual models.
Waterproofing: almost all the models we have reviewed are rated IPX7 and can be submerged. The exception is the battery-powered variant of Pro 4 Couples, which is only IPX6.
Battery: Satisfyer publishes battery capacity, charging time and usage time in its quick guides, which is more than many manufacturers do. Usage time is about 60 minutes for most models, while charging time is often two to four hours. Many models charge with a magnetic, product-specific cable; Pro 2 Generation 3, Pro 2 Next Generation, Secret Kiss and Pro+ G-Spot charge with ordinary USB-C.
Noise: Satisfyer often markets a whisper mode but publishes no measured noise level. According to the FAQ, the noise depends on how the product is positioned.
Warranty: Satisfyer states a fifteen-year warranty. According to the terms, it only starts to run once the statutory warranty period in the buyer's country has expired, the battery is excluded, the buyer pays the shipping when sending it in and the warranty does not apply in all countries. Check the terms for the country where you live.