The current official Garmin store list is authoritative.
Official product description
NIGHT SHIFT combines two switchable layouts, Classic Night Shift and Moonlit Dashboard, with two digital always-on styles: Classic and Moonlit Ring. View available heart rate and altitude trends, steps, distance, temperature, calories, battery and sunrise/sunset times. Readings and history depend on your watch and permissions; missing readings show --. Supports 12/24-hour time, metric/imperial units and automatic or manual location for sun times. Includes a one-hour trial. Permanent activation is CA$8 for this watch face and one NS1-XXXXXXXX Install ID. Enter the matching 12-digit permanent code in Connect IQ settings.
Trial & activation details
Install and try the design first, then confirm its name and supported Install ID format. Collect your matching code on the confirmed order page. Contact support first for older or unmatched IDs. Do not repurchase an existing activation.