The WS-80 is the latest model in the SWIFF AUDIO series, which received the highest rating for connection stability among low-cost guitar wireless systems tested by overseas YouTubers. Used for less than 10 hours. I've only charged it twice, once right after purchase and once after the battery ran out, so I don't think there's any battery degradation. Even in my environment, the connection stability was superior to BOSS wireless (I was able to play for 5 hours without a single dropout). The built-in vibrator in the main unit is very convenient because you can feel when the power is on. I really liked it, but I've decided to switch to a SHARE wireless system, so I'm selling this one. No box or instruction manual. As a bonus, I'll include 3 random picks. Everything in the pictures is included. 【Simplified Instructions】 ・Long press the button to turn on/off ・When both units are powered on, short press the button on the transmitter to switch bands (use if there is interference) ・Battery level is indicated by the unit's indicator ・The jack is screw-type and can be switched from 6.35mm to 3.5mm - Connection type: Wireless - Included: A to C (split) USB charging cable