foone🏳️⚧️ on Twitter: "If you remove the battery cap, you can see there's a little pad on the PCB under it. When the cap is closed, it completes the circuit, and turns
![Amazon.com: 2 Pack Wide Mouth Timer Cap Time Since Last Opened Fit Any Standard RX Bottle Inside Pill Timer Cap for Prescription Bottles Smart Pill Medicine Bottle Timer - Pill Bottle Timer Amazon.com: 2 Pack Wide Mouth Timer Cap Time Since Last Opened Fit Any Standard RX Bottle Inside Pill Timer Cap for Prescription Bottles Smart Pill Medicine Bottle Timer - Pill Bottle Timer](https://m.media-amazon.com/images/I/71WGq7FPfzL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: 2 Pack Wide Mouth Timer Cap Time Since Last Opened Fit Any Standard RX Bottle Inside Pill Timer Cap for Prescription Bottles Smart Pill Medicine Bottle Timer - Pill Bottle Timer
![Amazon.com: Bud Cap Timer - Medication Medicine Pill Vitamin Pet Med Reminder Timer Cap with Travel Size Compatible Bottle (1 oz.) : Health & Household Amazon.com: Bud Cap Timer - Medication Medicine Pill Vitamin Pet Med Reminder Timer Cap with Travel Size Compatible Bottle (1 oz.) : Health & Household](https://m.media-amazon.com/images/I/61cFu5z+ZtL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: Bud Cap Timer - Medication Medicine Pill Vitamin Pet Med Reminder Timer Cap with Travel Size Compatible Bottle (1 oz.) : Health & Household
![Amazon.com: e-Pill TimeCap and Bottle - Last Opened Time Stamp - Set Up to 24 Alarms Per Day - Easy to Use : Health & Household Amazon.com: e-Pill TimeCap and Bottle - Last Opened Time Stamp - Set Up to 24 Alarms Per Day - Easy to Use : Health & Household](https://images-na.ssl-images-amazon.com/images/I/61cFu5z+ZtL._AC_UL210_SR210,210_.jpg)
Amazon.com: e-Pill TimeCap and Bottle - Last Opened Time Stamp - Set Up to 24 Alarms Per Day - Easy to Use : Health & Household
![Amazon.com: Bud Cap Timer - Medication by Protection Pill Reminder Automatic Stopwatch Timer with Compatible Bottle (4 oz.) : Health & Household Amazon.com: Bud Cap Timer - Medication by Protection Pill Reminder Automatic Stopwatch Timer with Compatible Bottle (4 oz.) : Health & Household](https://m.media-amazon.com/images/I/41DknobYE4L._AC_UF1000,1000_QL80_.jpg)
Amazon.com: Bud Cap Timer - Medication by Protection Pill Reminder Automatic Stopwatch Timer with Compatible Bottle (4 oz.) : Health & Household
![TimerCap Automatically Displays Time Since Last Opened - Built-in Stopwatch Smart Pill Bottle Cap Medication Reminder TimerCap Automatically Displays Time Since Last Opened - Built-in Stopwatch Smart Pill Bottle Cap Medication Reminder](https://c.shld.net/rpx/i/s/pi/mp/10153480/prod_18467054524?src=https%3A%2F%2Fimages-na.ssl-images-amazon.com%2Fimages%2FI%2F515TmKatvxL.jpg&d=8fee05faabb4795b66b5c0509d73d7d5e0ca115c)