Joy-Con are distributed in pairs, designated as “Joy-Con L” and “Joy-Con R” respectively. They each measure 35.9 by 102 by 13.9 millimetres (1.41 in × 4.02 in × 0.55 in), and the Joy-Con L and R weigh 49 grams (1.7 oz) and 52.1 grams (1.84 oz), respectively. When measured from the top of the analog stick to the tip of the ZL/ZR trigger it has an extreme depth of 28.4 millimetres (1.12 in).
Joy-Con can be attached to the sides of the Switch console via rails, or detached and used wirelessly—either as a pair (comparable to a Wii Remote and Nunchuk), or divided between two different players. Up to 8 Joy-Con can connect to a single Switch Console at a time. The Joy-Con can be optionally attached to a “Joy-Con Grip” accessory, with or without charging capabilities, that convert the controllers to a more traditional gamepad-like form factor.
When detached from the console, both Joy-Con units operate autonomously of each other, and communicate with the console via Bluetooth. Joy-Con straps can be attached when the Joy-Con are detached from the console; the straps are slid onto the Joy-Con’s side rails. Due to the 14.5 mm (0.57 in) in added thickness they can help with comfort while the Joy-Con are held individually as the base of the straps widen the face of the controller and also raise the shoulder buttons used when the Joy-Con is held sideways.
Joy-Con contain non-removable 3.7 volt 525 mAh 1.9 watt hour lithium-ion polymer batteries; they are charged when attached to a Switch Console that itself is charging. A separate “charging grip” accessory allows the controllers to be charged in a gamepad configuration via USB-C. Nintendo released a Joy-Con AA battery pack attachment on June 16, 2017, with it sliding onto the Joy-Con similarly to the wrist strap attachments.More info.